Its the weekly listings at eBay. You'll notice that aside from the spike corresponding to a free listing day, listings are running at record levels.
Now there are those providing numerous excuses for the lack of pageviewers and bidders at Bidville, but the fact remains.
Sellers, lots of sellers, are paying 30-cents or more to list their items at eBay. They are not listing items because they want to help eBay's financial bottomline, they are listing items because there are bidders, lots of bidders.