It's been happening for about a year and a half now with the seller migration. The pumper here is FOS. Ebay's announcement's have speeded things up again. Even though not all e-commerce is on there, many sites have grown greatly in this time span. eCrater has been a nice sales channel for me and it's growing fast, your products feed to Google, and best of all it's free.
They will have gone from around 50,000 to 100,000 in listings when I first took notice to approaching 1 million listings in this time span. That's awesome growth in a year and a half. Don't let the pumper fool you, he's FOS.