Payback is able to run on <2 GHz machines though.
It runs nicely on my 500MHz iBook.
Grand Theft Auto is sluggish on PS2 (I almost feel nauseous after playing it for a while) and the Windows version needs one hell of a machine to play it with respectable framerates.
Personally I don't buy the fancy new Mac games for my iBook, but instead play the new ones that run well on my hardware such as Bejeweled, Escape Velocity: Nova, Payback and so on.
There is a market for this sort of thing. The whiners are usually not the ones who pay for their stuff anyway (at least in my experience).
Remember that some of the best-selling games are hunting simulators and card-games.
