Why are so many pining for the used games industry?

I can't remember the last time I paid more than £15 for a NEW Xbox 360 game. New games are dropping to 25% of their original rrp within as little as 8 weeks from launch. I seriously doubt I'd save a single penny going into my local store and picking up some tatty used copy and lining the pockets of some store who had nothing to do with the creation of these games. I can buy Tomb Raider, Dishonored, Far Cry 3, Bioshock Infinite all for around ~£15 currently if I shop around. This poor downtrodden gamer who can't afford to game without the used market sob-story is complete nonsense. Gaming can be an incredibly cheap hobby; I can buy 12hrs of top quality entertainment for the price of a cinema ticket and drink. But what if I buy a lemon then I need to sell it on to recoup some of the money!? Rubbish. Reviews, demos, it's not difficult to avoid the lousy titles out there, I can't remember the last game I bought which I hated. Can you get your money back for a lousy film you went to see? An album you didn't like?