According to eBay, over 15,000 PlayStation 3s were sold on eBay since the system launched on November 17th.
Although some launch day auctions went for as much as $9,000, the market for second-hand systems has cooled since the intitial hysteria. The average price paid for a PS3 was, according to eBay, $1,186.
As far as the other two next-gen systems go: 26,708 Wiis were sold on eBay for an average price of $412, and 331 360s were sold between November 12 and November 24 for an average of $421.
So maybe waiting in line for 3 days to pull a $500 profit from a PS3 wasn't the brightest business plan in the world...depending on how much $500 means to you, of course.