Yes, PCs are definitely less expensive, but most of their needs are relatively simple. They're just born that way. I guess most PCs find the extent of their processing power used for Blood Money or Tank Commander.

In contast, take the elegance of Macs in white (even after Labor Day), their big, wide screens, gazillions of colors and the friendly, fecund Creative Suite. It even sounds pleasant. Ahh... Creative Suite.
Sure Macs cost more, but face it, they're MACs.

As someone who has done some cross-platforming in the past (OK, so it was mostly in the college days) and even some multi-OS-using (no comment) all I can say is there are pros and cons to both.