Just to clarify, BYU won't expel or probate someone for being attracted to members of the same sex, they will expel someone for engaging in extra-marital sexual activity. So conceivably a gay or lesbian person could work for or attend BYU without consequence so long as they lived by BYU's "honor code". I'm not necessarily saying that I agree with that position, but it is what it is.
As for your boycotting of Utah, I'll let the Salt Lake City Weekly's Ryan Bradford speak for me in that regard:
http://cityweekly.blogspot. com/2008/11/dear-dan-savage .html