Why does this have to be such an issue for people?
If Apple made a two button mouse with scroll wheel, the best mice would still be from third-parties (Logitech, MS, etc.) And who knows, the third parties might stop making drivers for those awesome mice, seeing as Apple is "entering the marker for input devices."
I for one, like the simplicity of a one-button mouse. And if I want two/three/more buttons, I can get a third party mouse, or use the mouse from my old PC, or whatever. Making it a BTO option would just confuse the Joe Schmoes whom Apple seems to be targeting, the pros who need more than two buttons and a scroll wheel (like tablets, trackballs, touch screens, pen inputs, etc.) would buy something else anyway, and the development cost for this new mouse would get tacked onto the price of Apple hardware. Is it that hard to use your left hand to hold the CTRL key instead of using the middle finger of your right hand? It's not like you can write a novel with one hand on the keyboard and your other hand on the mouse. And if you don't want to "pay" for the one button Apple Mouse, just sell it and get yourself something you'll be happy with. Laptop users can gripe a bit more, as you can't change the trackpad really, but you can use an external two button + scroll wheel if you're that desperate for right-click.
Sorry if this comes across as the wrong way, but I've heard this stuff before, and I always say the same things in response to it. It's not life and death!