But, as soon as my IBM Model M keyboard stopped working last month, it really bothered me (it was my fault for spilling coffee on it). So I got my backup Cherry MX Blue keyboard from Rosewill (also a nice mechanical keyboard for only $60 or so) and then proceeded to take apart my IBM keyboard in the evenings, to see how it works and fix it. I just got a new membrane for it and am doing what's called a "bolt mod" replace plastic rivets in it with bolts.
It is completely irrational spending all this time on it, but it am really attached to that particular keyboard.