and it really does surprise me that more people aren't using it.
I don't know too much about the BSDs, but I think you hit on one reason OpenBSD might not be more popular here:

4).. No blobs!-- Don't you just hate those closed source drivers...If they can't get the docs on it or reverse engineer it, it's not included...
I wonder how many people wouldn't use Linux if their new ATI or nVdia card couldn't be used. Also, is it possible that people perceive the BSDs as less "user friendly" than Linux or especially Windows?