Just like the game advancing and moving forward bits and piecs at a time so should your computer!
I can't dump a bunch of money into a computer every couple of years, but I can put a bit aside when I can and buy that new powersupply, or a new video card, or a new cpu. Upgrading a little at a time don't hurt so much and still keeps you in the game.
And for those who are saying that they "won't upgrade just to play a game", well I'm sorry for ya, but also the world ain't going to stop for you either. Pay the piper, or get off the ride. My brother in law loves this game, but with 4 kids, and a house payment he just couldn't swing it so he doesn't play anymore after paying HTC for years. You do what you got to do.