A. Probably not as much as this guy does. (Try link above for a truly staggering amount of typewriter info and pictures). I am doing some banners for Living Writers week, and for one design I have been looking at a lot of typewriter keys. They are beautiful things, and they often share a common font design, that I am finding very hard to pin down.
There are many sites offering jewellery and knick-knacks made out of old typewriter keys. I would like to get my hands on some (keys, not jewellery) but part of me worries that the trade in keys is compromising the work of typewriter restorers.
And another part of me thinks this is a very minor thing to be worrying about in today's world.