I am noticing the same thing, my WalMart used to have 4 shelving units of 5 shelfs each for PC games (one with jewel cases, one with education/kids games, and two with regular games). The console and handheld games were all behind locked glass in one or two shelving cases per device. They also moved the PC games across their electronics section to the opposite corner for no reason other than filling those shelves with rockband and guitar hero boxes (a few too many if you ask me). They also have had an excessive amount of copies of WoW's 1st expansion at one time, and recently had 30 copies of Red Alert 3. It is also now only on 3 shelves iirc.
At Futureshop they switched all the video games with the music and movies so the PC games have only 3/4s of the space, but so do the other sony/MS/nintendo games. Again, they have an excessive amount of WoW 2nd expansions.