Some people can if they view it on a large enough screen, and the video game is of a virtually simulated 3d environment. Usually people become motion sick from watching views from helicopters, vehicles, etc.
Yes, lots of retailers do special offers where you can trade in a video game for some money off a new one. They normally do offers where if you trade in a month old game, you can get a just-released...
Video games are used for a video witch has been changed to a game not to be confused with a made up game like c.o.d or battlefield which is just a game.