Mahalo Wikis

Yeah, I seem to be one of the few people who isn't instantly in love with wikis. I wonder if that's because I haven't really done much group work before. I use wikis, sometimes I even just go to wikipedia (I can hear my Lib Tec teacher screaming). I can even see the use of creating a wiki for students and library patrons, since there's just so much for people to know about us. I just can't see how I would use a wiki that was only for staff. Maybe other, more experienced people could let me know?