Soldato
but the reason for this now is just because that's what they've always used.
Obviously that benefit has gone now, if the software developers released a windows version the only difference would be the interface.
I can assure you that the studios don't use Macs just because that is what they have always used.
Secondly there would be far more of a difference than just the interface. One is BSD under the interface and the other is a rather ageing legacy code set underneath.
However as has been said some people just like me like to game so a nice PC gives a good return on investment.