I don't care for configuring old OSes, and installing isn't that much fun.
I'm not one for playing old games on old platforms.
But I do like having a plethora of old libcs and gccs on different architectures to test against, just to be sure my code isn't too heavily Linux dependent, you know. I have a few other OSes around for the same reason, and a sprinkling of Windows versions. It's just *satisfying* somehow when everything compiles and runs in umpteen environments.