You might be able to sell it for anywhere between $10 and $30 bucks if it's just you and the buyer and no middle man. I doubt gamestop will take copies anymore, so that could help...but it all boils down to one thing: demand.
If there's no demand, it doesn't matter how much or little you charge for it...it won't sell if no one thinks it's awesome enough lol
No more than it already is, probably less. The whole issue with them destroying copies is pretty meaningless at that point. It has the same number of copies out there as pretty much any other game that didn't get a reprint run.
I doubt gamestop will take copies anymore, so that could help...but it all boils down to one thing: demand.
They probably will. I've seen them sell press and store display copies on numerous occasions and those are literally marked that they aren't supposed to be sold. The laws for used sales and new sales are different.