The buyrates for the last two UFC pay-per-views are in, and as was probably expected, UFC 186 was a flop.
"The 3/14 show with Anthony Pettis vs. Rafael dos Anjos is estimated at 275,000 buys and the 4/25 show with Demetrious Johnson vs. Kyoji Horiguchi is estimated at 100,000 to 125,000, which is the same baseline figure that UFC did for Johnson headlined shows last year. If you include Canada, you probably would get a 10-20 percent higher number."
That UFC 185 line is just about consistent with the only other pay-per-view Pettis has ever headlined, which was his title fight win Ben Henderson at UFC 164 in 2013.