Well there are definitely two different sides to it. I usually buy games that I like when they first come out, hence they are new. Games come out that I don't personally think are worth the full price due to content(or lack thereof) and other factors and I either(usually) wait for a price drop or buy it used.
I do want to give the developers money for the games they create. But, if I'm low on cash, I'm not going to deprive myself of the experience JUST to buy it new....
