the Second-Hand market is in every god damn media out there. Books, TV box sets, Movie box sets, music, etc....they all do fine with it. Video Games can do fine with them to.
So, my answer is Piracy. It's illegal, you're not "sticking it up to the man" when you do it, all you do is make things worse for the legitimate customers as they have to deal with more and more restrictive crap that the developers impose because you god damn pirates are making them think it's getting worse!
Piracy starts a chain reaction of bad, and while I won't say that I never succumbed to the occasional downloading of music, the rampant piracy for games to "stick it up to the man" has done nothing but make the situation worse. Spite Piracy is perhaps the worst way of striking a blow to developers.