EBay For Billionaires?

Forbes reports:

In the market for a 51-carat pink diamond? How about a $74 million, 313-room resort in Puerto Vallarta, Mexico? Perhaps you'd like to buy Alex Rodriguez's Miami mansion for $9,999,999?

These items--plus a slew of other pricey toys--are available on a new auction site aimed at the mega-rich. But will anyone with a significant net worth actually buy a big-ticket item online?

BillionaireXchange.com, which launched this week, touts itself as the first online marketplace exclusively for billionaires. Of course, it's not; there were only 793 billionaires on the planet at our last tally of the World's Billionaires. The members-only site requires clients to have a mere $2 million in liquid assets.