I've been selling a ton of my PS2/PS3 games on amazon, and I never had a bad experience.
For the record, I've sold more than 60 games, for a total earning of more than 1100$ after amazon commission (in 5 years).
From my experience, make sure that if there is a multiplayer it isn't binded to your PSN account (in that case, you can sell the game with that statement being very clear).
Amazon also charges the shipping to the customer (typically ~5$ for a game), and takes commission when sold (around 5$ for a 30$ sell) . It's your responsability to ship the game, but as soon as you've sold at your first one, you'll get the hang of it and will want to sell every other game you have ;)
Good luck !
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