I doubt there is anything to worry about.

I don't know how often a UFC event takes place but my understanding is that it's a whole bunch of fights on one card, about 4 months worth or so.

Trust me if PBF vs De La Hoya, Calzaghe vs Jones, Wlad vs Valuev, Pacman vs Berrara 2, Valero vs Morales and Hatton vs Castillo were all on one card it would get a lot more than 775,000 buys