I already did! I went from a Compaq 233 Pent II to a Dell 1.9 Gig Pent IV....JUST TO PLAY ACES HIGH!
My FPS went from 17 to 75!
Now, if I had to do it again, less than a year later...well, that's another story. I could not justify spending another 2 grand so soon. Of course, this is a theoretical discussion.