For starters, I will delete any post on this thread which actually provides links to or instructions of how to obtain copyrighted material.
So, MUSH-dom uses a great deal of proprietary systems, adopting them or even using them verbatim from books written for table-top RPGs.
Do you usually buy them or obtain them from Somewhere Else? Do you do find you're doing that right away or once you have play-tested them for a while to ensure you like them or that you're sticking around in the game(s) that use them?
What's your annual budget like for gaming material that you use for MUSHing (which doesn't need to be exclusive of course, if you're also using the same books for table-top as well)?
Are we a freeloading community?