To be truthful, if I were a game publisher I wouldn't waste my time coding a game to Mac OS X.
Why? There is no Mac computer that is dedicated to games.
The Mac Pro is close but (as you say) it is not intended to be a gaming computer.
It's not a big deal to me as I play one game and one game only.
The game that I play they are trying to code to multi-core computers but it is a lot more difficult than people realize.
I was just reading about the MS staff that are working on Microsoft Flight Simulator, they too are having a rough time trying to code to multi-core via Vista.
Anyway, I'll use the Mac Pro for video and image editing and 3d rendering and (whispering) I'll use it for my one game.
I think there are enough Mac users interested in gaming to make it worth while.
Which kind of contradicts what I say above. My excuse is I am tired.
There are quite a few Mac users that have PCs just for gaming.
And Apple's computer market share is rising so again more gamers.
Ya as market share rises it will be interesting to see which way Apple go on this.
They might just look for a gaming console as well to plug the gap.