I'd bought the laptop first, got the MM because it's small and good for travel and using the top as a trackpad/scroller.

Then I bought an iMac and the 2nd MM came with it.

I'm pretty sure that I'm not that unusual.

> I'd sooner believe it's because they want you to buy 2 of them, so you can charge one while using the other.

We're discussing in this context. I still stand by the claim that there are probably around zero people on the planet that bought a second MM specifically to use it while the other one is charging.

I'm not doubting that there exists a group of people that happen to have acquired two MMs, however that came to be.