They are mainly bought by people in the design industry as work machines. I guess many games producers rate mac as a lesser priority because of this fact.
macs are cheaper......BAHAHHAHAHAHHAHA you are fuckign kidding right? Anyway 89% or so of the P.C.s made are used for games and internet. Who wants to rush games out for a work platform. Plus apple only atkes up 5% of the market (if you really round up)