I think it's just because they weren't there first and now they've gone without for so long they think they'll lose face if they release a multi-button mouse. Still, yes, it's unbelievably stupid of them not to, at least on the Pro line. Of course, Granny and little Jimmy might prefer one button mice - maybe - but the OS natively supports two button mice and easily supports multi-button scroll mice. It seems like you just need to tack on $30-$100 when buying to account for the additional mouse purchase. It seems impossible to argue that a non-scrolling mouse is easier to use than a scrolling one on web browsing as well as virtually every other app. And how is it easier to control-click than right-click? It isn't. It doesn't really bother me with desktop systems (other than adding a required purchase) but it irks me on the notebooks.