I haven't purchased a used game in years. I got nothing against it, I just prefer new games and they are pretty easy to find on the cheap if you're patient.
I'm going with the PS4 out of the gate though because I appreciate the pro-consumer attitude...more so than the actual thing Sony is doing with it's lack of restrictions on disc based games and online check-ins. Microsoft's policies wouldn't affect me, but they bother me. I think consumer rights are an important thing to stand up for and even when everything is digital I would rather have my eggs be in Sony and Steam's baskets.