These changes were announced in late January and go live in March 30. 
In this post we'll provide a unique view of the 
economic  (fees) impacts of SR10.1.  First, we'll look at the  fixed-price listing changes (stores and fp30) and then the auction  changes in detail.  Then we'll look at three new strategies for sellers  to consider going into 3/30.  Finally, we'll save editorial thoughts for  the end.
Fixed-price changes
Historically, eBay has had two fixed-price formats:
- Store Inventory Format (SIF in eBay-speak) – A  fixed-price listing that does NOT show up in the eBay core search  engine, but does show up in a seller's store.  SIF items are $.03-$.10  depending on the category and back-end loaded FVF with 12%/8% with the  tier break at $25.
 
- 30-day Fixed Price (FP30)- A newer addition to  eBay, this is essentially a SIF item that does show up in the core  search engine. FP30 is $.35 to list and has a tiered FVF starting at 12%  for most categories.
 
For the SR10.1 release, eBay is making these fixed-price changes:
- SIF is going away and (this is important and missed by many sellers)  – your existing SIF items will be automatically converted to FP30 going  forward.
 
- FP30's listing fees are going up from $.35 to $.50, but you now have  the ability to 'buy down' the insertion fee by paying for monthly store  subscriptions.  At the highest store tier, the FP30 listing fee is as  low as $.03.
 
We've received a lot of questions about this topic, so let's dig into  it a little.
Here is how the store tiers work:
- Before March 30 (old pricing) – FP30 is $.35 to list
 
After March 30:
- No store – FP30 is $.50
 
- Basic store – $15.95/month, FP30 is $.20
 
- Premium store – $49.95/month, FP30 is $.05
 
- Anchor store – $299.95/month, FP30 is $.03
 
There's obviously some math to think about here and we've run some  scenarios to show you the best tier for various listing volumes as  illustrated here:
The highlighted areas illustrate that if you list:
- > 50 items/month you should be in the Basic plan.
 
- > 230 items/month and it's time to upgrade to the Premium plan.
 
- > 12,500 items/month – welcome to the Anchor plan.
 
Auction economic changes
Good ole' auction format is getting a price overhaul that  significantly lowers the insertion fee (especially for lower start  prices) and bumps up the FVF.  Also, like FP30, having a store yields a  discount.
Here's a chart that shows the changes from one view:
The biggest change in auctions that everyone should be aware of is  that before the price change, the FVF for $25-$50 was 3.5%.  After the  changes, eBay has changed that to 8.75% which is a more than doubling.   Sellers that auction items in this level should be extremely aware of  the economic impact of that change.  (for example, many $1 no-reserve  sellers of video games, DVDs and some electronics will see  a significant FVF increase here.
Economic changes cheat sheet
Remember that regardless of format, if you are a top-rated seller  (eTRS) you can earn a 20% reduction in FVF fees.  If you are an 'Above  Standard Seller' (ASS), then you do not receive that reduction.
We've looked at the fees from several angles and found this BEFORE  (left column) and AFTER (right format) format: (click to enlarge and  print out as a handy cheat sheet)
If you have any more questions about the fees, feel free to post them  in comments.  Also eBay has some great resources available:
- General overview is here
 
- Fee details are here
 
- Interactive fee calculator is here
 
Strategy 1 – Go ahead and pick your store tier today
eBay has generously allowed for sellers to go ahead and pick their  store tier and not incur the fee until April. Historically when there  are 'BIG' eBay changes, sellers that anticipate and take advantage of  the changes can have a competitive advantage.
A couple of tips:
- Remember your store items should be considered as well.  If you  normally have 500 FP30 and 1000 store, you should figure out how many  store items (see strategy 3) you plan on converting and make your  calculation from that total number.
 
- Remember the 50, 230 and 12,500 break points for the store tiers
 
- To keep your eBay sales where they are today you may need to surge  your listings, so make sure you consider this in your calculations (see  strategy 2)
 
Strategy 2 – Prepare for what a flood of listings will do to  your eBay business
Old-timer eBayers remember when eBay decided one day in the  Cobb/Whitman regime to put all of the store listings in the core search  engine.  It's commonly known as the 'store in core debacle'.  Now a lot  has improved and changed at eBay so I don't think we're heading for a  crash and burn scenario.  But, our data indicates that we are going to  see a significant surge in fp30 listings (we are already seeing this  three weeks before) across the marketplace.
We're advising sellers to run some 'stress test' secenarios:
- What if we see a surge in listings of 2-4X?
 
-  
- Remember, one view is listings are going from .35 to .03 –  nearly 'free' – we could see as much as a 10X surge. 
 
 
- Will your items be found?
 
- What should you do to compensate?  Some suggestions:
 
-  
- Surge as well – do you have inventory you haven't been listing  on eBay?  This could be a great time to try it to support a surge  (adjust your store tier accordingly)
 
- If you've moved 100% fixed price, consider adding auctions  back to the mix – we don't anticipate a surge there, so you may actually  have more visibility
 
- Consider shorter FP durations – we have seen some sellers  already having success with FP7.  Many sellers forget this is still  available and creates a sense of urgency with buyers. 
 
 
Strategy 3 – Don't look at your store inventory performance  and assume under-performers will not work in the FP30 format.
We've talked to some sellers that I believe are looking at things the  wrong way. They are looking at SIF listings and for those that don't  hit a conversion rate threshold.  Remember that SIF items are not seen  in core search.  So when they convert to fp30 and are in core search,  you should see a natural bump in conversion rate (well, we don't know  what the surge will do, but generally this is the case).
In other words, don't do an apples and oranges comparison here and  under-shoot on items that probably will work in FP30 once search traffic  is added to the equation.
Editorial comments on the economic changes
From the 30,000-ft view, I think these changes are very positive.  eBay is moving closer to the Amazon economic model which puts more of  the risk on the marketplace and not the seller.  The result is going to  be more selection on eBay which is always a good thing.
I worry that the auction fee changes are going to accelerate the  demise of that format, with perhaps the surge of listings helping there a  little as sellers have to do some auction for visibility.
Finally, if you haven't caught on, I'm really, really, REALLY worried  about the eBay search engine implications.  Before these changes  sellers are extremely frustrated with BM and the inability to understand  why their listings aren't showing up.  A 2-10X surge is going to make  this problem worse.  Regular buyers know that the search engine  experience on eBay is still, well, really bad and full of spam-y junk.   eBay has made some good first steps, but I fear they won't be enough  for the April surge.
Also, someone mentioned in comments, what does this mean for the  small seller.  I honestly don't know.  If eBay could nail the search  engine, then I think that unique smaller seller inventory would continue  to do well.