With a wire? Yes the charger has a wire, big deal. So does rechargeable batteries, which are cumbersome and takes up wall sockets and or space on your desk. And no the Magic Mouse is not just a mouse and nothing else, you need batteries. And yes swapping often over the life of the mouse is a pain in the a##. And your rechargeable batteries did cost you something didn't they? Having your mouse die right in the middle of doing something important is not fun. And no you don't have to place it there daily, one charge lasts six days, so just about once a week.
Yes you pay more up front. But it is worth it for the connivence alone. It does not cost much more than Apples batteries.
Swap every two months. You must not use your computer that often. I am lucky if mine last two weeks. I have the Apple batteries, the Sanyo eneloop's which are the same as the Apple batteries but cheaper. The Apple batteries are repackaged eneloop's.
These are the best batteries on the market today, last the longest. And still only two weeks of heavy use.
The Magic charger is the best accessory to come out of CES this year for the Mac.
It even makes the Mouse lighter. Lasts Six days on one charge. Since all you have to do is set it on the charger pad when not in use changing batteries is a thing of the past.
What's not to like.
I use my computer from 12-16 hours a day. My batteries last me two months. I use my keyboard a lot (that's one benefit of a mac).