Thanks Leon. I didn't think about other boards using the same system, or to just google for an answer. While not a direct answer, I did find this:
http://forums.bimmerforums.com/forum...cription-limit
Post #12, the guy says he has over 11k subscribed threads, and they look to be on the same system. So I think I'm safe for a good long while (currently at 69)
