UFC 192's main event may have been an excellent contest between Daniel Cormier and Alexander Gustafsson, but it looks to have been a bust on pay-per-view.
If there was ever a reason not to have Daniel Cormier's next title fight come against anyone not named Jon Jones, the UFC 192 buyrate is Exhibit A, B, and C. According to Dave Meltzer's Wrestling Observer Newsletter (subscription only), it will "finish in the ballpark of 250,000 buys," making it the 2nd worst selling light heavyweight title fight in the TUF era, as well as the 3rd lowest selling PPV of 2015 (only ahead of both UFC 186 and 191 - both Demetrious Johnson title fights).