I personally wouldn't pay much. However I am sure something like that would sell fairly well. In order to be legal with ebay it must be a un-used account and the package must be sealed.
Hmmm. well, *if* I had money to burn, I'd pay oooohhh.... $200-$400 for it...? Since the normal collectors edition is $89 or whatever, your must be worth a *bit* more now.
However, eq2 just came out only 6 months ago! Once it reaches the popularity of eq1 I'm sure it would probably be worth hmm maybe $400-$500, hehe..
but really I'm just making guesses here :)... good luck!