Some people do not cope well with chaos.
MOOs are chaotic at times.
Other times they are quiet refuges where you can work on your own projects, chat with one or two friends, meet quietly with students. But many times MOOs are loud and messy, especially when you introduce groups of new users. The more people talking in a room, the more text scrolls by. If you are bringing in new users, the demand for help can be overwhelming. And yet, as Cogdill points out, work does come from play.