Quite honestly, I'd hate to see paying roguelikes. Already UnReal World annoys me to no end. Right now, it's got the kind of niche I like. Well, except for Krice...
Right now, people are playing and programming this for fun, pleasure, for a good time. If you start commercializing, I think the community wouldn't be as great as it is now, everyone willing to discuss and help a bit. Well, except for Krice.
Donations are another matter, but you can't really rely on them for much.