Nope doesn't work like that. Your cd keys are bound to the account you made. ( you have to enter them in the account creation screen ), so selling your game disks is pretty pointless, there's free client downloads off of the world of warcraft website even.
PlugY for Diablo II allows you to reset skills and stats, transfer items between characters in singleplayer, obtain all ladder runewords and do all Uberquests while offline. It is the only way to do all of the above. Please use it.
Supporting big shoulderpads and flashy armor since 2004.