Well, the way I interpret the drop in sales is two-fold...
The economic situation in the U.S., and the problem with the default search format 'Best Match'.
In order to sell a product, the consumer needs to know you have that item for sale. You can have the best product on the market for sale, but if you do not market that product, nobody gets to see it, nobody knows you have it for sale, and it sits on the shelf collecting dust. The end result is you have money tied up in an item that is not selling. Why? Because nobody knows you have it for sale...
With the default Best Match search criteria, only the Auction type formats show up first, and then the BIN items are thrown in here and there. If you are selling common items that are not Unique in nature, you are lucky to see your items on page 4 or 5 after initiating a search with the Best Match search results. Buyers do not have a tendancy to scroll through pages and pages of listings unless they are looking for a specific unique product, not a common product for sure...
eBay gave us a break with the 35¢ listing with BIN items, but then took it away with the Best Match search criteria...
The only way to get good exposure is to list your items with the Auction format, and doing so costs you extra above and beyond the 35¢ BIN listings...
Pierre showed us the graph which indicates the listings on eBay have increased exponentially, but again, with more listings, comes more search results, and depending on the item, in the thousands! Just because there are increased listings in the BIN format because of the listing fee break we received from eBay, does not mean you will be selling more of your products.
I think it may have been better for me to leave the listings in my store, and put my money towards Auction format listings, and entice people to visit my store in my auction listings. That way my listings would get better exposure with the Best Match search criteria...

"If we had no winter, the spring would not be so pleasant: if we did not sometimes taste of adversity, prosperity would not be so welcome."