Invite flood

A big wave of invites is at isnoop. According to its stats there are 1507321 invites available. It is all possible thanks to generosity of Google - every Gmail user has received 50 invites. Anyway still there are auctions with invitations on eBay. I do not understand why people are willing to pay for the invite...
P.S.
It seems that it was just a glitch in isnoop stats because few days later number of invites decreased 10 fold.