I personally like to be able to take a game back if I don't like it. I haven't taken one back yet, however I know that if I buy a used game from GameStop I have 7 days to try it to decide if I like it or not.
I remember spending $299 for the TurboGrafx-16 CD add on at Babbages....I couldn't believe I was spending so much for an add on to a game system. Amazing how crazy that was back then....
Of course, one of my friends had to get the 3DO when it first came out....yes $799 baby!! I thought he was crazy, but hey, I got to benefit from it