I don't like wired mice for the same reason I wouldn't want to use a wired Wii Remote. I use my mouse by physically moving it around my desk, and I find the tug of a physical cable to be distracting.

I can't say I've ever had tracking issues with the Magic Mouse either. I certainly don't have any with the wireless Logitech G305 I use now, which was designed for gaming and feels particularly precise and responsive.

If we were talking about keyboards, I'd be more sympathetic to your viewpoint. Although even then, I like the clean look of my wireless keyboard, even if it means I have to swap batteries once every couple months.