Video games online are usually very expensive and tend to get boring once you've played them a couple of times. People normally like selling them off for newer ones or exchanging them for something else. Typically, if you sell a game at a retail outlet that buys used VG's you may not get such a good price, but if you auction it off online you can actually earn a lot more cash.
Here are some things to bear in mind when trying to sell video games online.
Newer The Game, Better The Price:
First have a look at the games that you are planning to part with. Remember, the newer the video game, the better price you will get for it. On the other hand, if the game has become old, it will lose its value as its retail price will fall on it. Therefore, make sure you sell off a game during the time it's popular.