Eh, they need to sell bikes, so they're probably going for the color scheme that appeals (or at least, does not turn off) the largest cross-section of customers.

Face it, orange or purple frames can be striking, but not all that many people would want an orange or a purple frame. And I suppose red is sooo last year.

At least they're getting away from pink for women's frames (who knows, maybe they got nasty letters from the Komen foundation ... )