02/23/2013 UFC 157 Rousey vs Carmouche 450,000
03/16/2013 UFC 158 GSP vs Diaz 950,000
04/27/2013 UFC 159 Jones vs Sonnen 530,000
05/25/2013 UFC 160 Velasquez vs Bigfoot II 380,000
06/15/2013 UFC 161 Henderson vs Evans 140,000
07/06/2013 UFC 162 Silva vs Weidman 550,000
08/03/2013 UFC 163 Aldo vs Jung 180,000
08/31/2013 UFC 164 Henderson vs Pettis 270,000
09/21/2013 UFC 165 Jones vs Gustafsson 310,000
10/19/2013 UFC 166 Velasquez vs JDS III 330,000
11/16/2013 UFC 167 GSP vs Hendricks 630,000
12/28/2013 UFC 168 Weidman vs Silva II 1,025,000
02/01/2014 UFC 169 Barao vs Faber II 230,000
02/22/2014 UFC 170 Rousey vs McMann 350,000
03/15/2014 UFC 171 Hendricks vs Lawler 300,000
04/26/2014 UFC 172 Jones vs Teixeira 350,000
05/17/2014 Bellator 120 Rampage vs King Mo 100,000
05/24/2014 UFC 173 Barao vs Dillashaw 215,000
06/14/2014 UFC 174 Johnson vs Bagautinov 115,000
07/05/2014 UFC 175 Weidman vs Machida 545,000
08/02/2014 UFC 176 Aldo vs Mendes II Canceled
08/30/2014 UFC 177 Dillashaw vs Soto 125,000
09/27/2014 UFC 178 Johnson vs Cariaso 205,000
10/25/2014 UFC 179 Aldo vs Mendes II 180,000
11/15/2014 UFC 180 Werdum vs Hunt 185,000
12/06/2014 UFC 181 Hendricks vs Lawler II 400,000
01/03/2015 UFC 182 Jones vs Cormier 800,000
01/31/2015 UFC 183 Silva vs Diaz 650,000*
02/28/2015 UFC 184 Rousey vs Zingano 550,000*
*preliminary
First, note GSP as the one true bringer of PPV buys.
Now, it isn't totally clear to me that she got buys because of her or if UFC buys are just up period. I think if she is headlining another weaker card (from a marketing standpoint!) that'll tell the truth. She was low on buys a year ago and so was everyone else. She's high on buys now and so is everyone else.