I think there are two possible reasons. The first is they stand to make a lot of money from selling high spec machines to creative types (look at the upgrade co

I think there are two possible reasons. The first is they stand to make a lot of money from selling high spec machines to creative types (look at the upgrade costs to the new Mac Mini) simply because the cost of a computer is a drop in the bucket for large media enterprises. And the second (may be a little optimistic from my end) they gain a lot of prestige from their computers and software being used to make media and art.