"Dana also pretty much admitted that he's going to have to jump off the Mandalay Bay once they figure out how to do it. He did not give a buyrate figure, but the number we've heard from several sources now both inside and outside UFC is approximately 1.72 million buys."
http://www.f4wonline.com/content/view/10128/
http://www.f4wonline.com/content/view/10128/
Personally what impressed me more was that 25million people tuned in to watch UFC 100 in Mexico which aired for the first time.