Ebay price is a function of demand over availability.
Seeing how right now there isn't a clear idea on what demand will be for next gen consoles and what stock will be available, buying to resell one on ebay is probably like buying a lottery ticket and expecting to win...
One thing for sure though, what ever the demand/availability you will not see the kind of speculation there was with the Wii as Sony and Microsoft will do a much better job managing availability than Nintendo did..
I would actually not be surprised if the majority of the people that bought to resell, hoping to make a profit, end up loosing a money. There was much so much money made of reselling on ebay last gen that it is tempting more people to play the game this year and this will bite them back
PS3-Xbox360 gap : 1.5 millions and going up in PS3 favor !
PS3-Wii gap : 20 millions and going down !
