I never predict stock prices, but if eBay is trading at 215, BID should be at 1,000, AT LEAST. The real money in online auctions will not be made by handling $20 and $50 items--it will be made in the higher end merchandise. I use eBay, and I can tell you that when an alternative exists like sothebys.com, that's where the high-end merchandise will go. There are MANY non-authentic items being sold to the unsuspecting (which has already been documented in the press), and high-end buyers will flock to a site where items have been authenticated and are guaranteed, with a solid 200+ year-old company standing behind them.
There's a reason why eBay's commission rates are so low--they're just a conduit. They take no responsibility for authenticity or for actions of the seller. Sotheby's may charge more, but the sellers and buyers know that you get what you pay for.