I'm in the exact situation as you man. I still haven't finished Infamous 1. I have 2 sitting in its wrapper. Never had a chance to fully play SF4 AE. So many games I want to play, so little time.I think its more a case of PC gaming budgets being lower due to lower sales. Console is king right now.... and if your PC game requires a processor no more than ~6 months old then the potential pool of people who can run the game is tiny.
I've seen Street Fighter X Tekken as low as $25 on craigslist, but I think I will definitely give it a pass. I have too many games already and not enough time to play them, much less a game that half the people who own it are complaining about!