I have to agree, I have been shopping for a host for another site I'm working on and the providers that accept UBB all have strict warnings about their usage. I'm not talking about 2 or 3 I have contacted a couple hundred with e-mail inquiries and the answers are pretty much the same across the board, either they do not allow them or they barely tolerate them.
I'm very thankful that my netwerkin host has worked with me on keeping my site there and running a UBB.