Because you have to actually buy the games! *piracy rimshot*
But really, when a new game comes out, at most you will see a deviation of about $15 USD between consoles and PC. If a game is selling badly, its price will drop steadily. Wal-Mart is selling duke nukem forever for $9.96 right now, but super smash brothers brawl is still hanging out at $50. Halo 3 took something like a year and a half to drop below $50 while some games hit $40 or less in the first few months.
Where ever the industry thinks that maintaining a higher price on a certain system will make it more money in the long run than dropping it slowly with the rest, they will hold fast.
But really, when a new game comes out, at most you will see a deviation of about $15 USD between consoles and PC. If a game is selling badly, its price will drop steadily. Wal-Mart is selling duke nukem forever for $9.96 right now, but super smash brothers brawl is still hanging out at $50. Halo 3 took something like a year and a half to drop below $50 while some games hit $40 or less in the first few months.
Where ever the industry thinks that maintaining a higher price on a certain system will make it more money in the long run than dropping it slowly with the rest, they will hold fast.