They had one specifically for grinding snuff (powdered tobacco) until recently, and there is still one that exclusively grinds paint.

Because they know you can't afford it.

Yes, pretty much everyone did by the late '80s, including Apple - the mouse second from the left is an opto-mechanical mouse that replaced it and was becoming standard on new Macs by that time (the ones these mice were plugged into were mainly Mac and Mac Plus models, getting a little obsolete by that point).

I had a Kensington trackball on a PC at the time, which plugged into a serial port (PS/2 didn't really start to proliferate on new PCs until about 1990), and I also used the three-button mouse on the Acorn Archimedes.

I used the original Apple mouse pictured in the late 1980s.

It was terrible. It was just so bad, even by the standards of the day. Fully mechanical, (rather than opto-mechanical), so it would stutter across the pad in a jerky motion, and it had one button at a time when two or three was already standard on other platforms.

They got away with it because most customers had never used a computer before and didn't realise just how hard it sucked.

You'll be able to understand their American accents quite easily.