Game collectors. Are NES, SNES, Atari, etc games going up, or down in value?

I would personally say they are going down. Back in 2006 or 2007, they were selling for a lot of money, but now they seem to be going down, especially with the games available on Virtual Console or Xbox Live. It really depends on the condition of the games. If they come with the box and booklet, then they will definitely sell, but they won't sell as much if it's just the game.