CougarClaw, I have been following Big 12 athletics since the beginning(15 years ago), and I do not remember any instance where the league ever asked any member school to post certain types of advertising in their athletic facilities. If BYU wants the Big 12 to put it in writing that you will retain control of your own local advertising then I am confident that the Big 12 would be fine doing that for you.
Regarding the school finances....... most of the Big 12 schools do publish information about their budgets. However, they are almost all state schools, so therefore, they are sort of required to give out that information. I attended the one private school in the league(Baylor) and there have been plenty of times that we refused to give out financial information based on the fact that we are private and we don't have to. It's not a problem and nobody has ever cared in the slightest.
I could be wrong, but it seems like most of the issues in the initial poll here are workable except for maybe the rebroadcast matter. The Big 12 might be okay with it but you have to consider that the TV officials(ESPN, Fox, Versus, etc) all have a say too and perhaps they are the ones who are refusing to concede this point.
And regarding the national TV broadcasts...... it is my understanding that the Big 12 gives the TV rights to the TV people and then they decide which games are going to be national and which ones are going to be regional.
I think that the Big 12 would agree to commit to BYU in writing to some of these issues but not everything
no sunday play - fine
no play for BYU during conference - fine
rebroadcasting rights for BYUtv - this might be the problem that is holding everything up
guaranteed # of national games -- no guarantee(but BYU really doesn't need one)
control of advertising in local Provo based facilities - fine
add another western team -- no, not fine, the Big 12 will not agree to this
privacy of church financials -- fine
guarantee 12 members in conference - no, not fine, the Big 12 will never commit to this
TC