I don't know if people actually do buy previous events from them still...
If the previous events were made available I'm sure there would be more fans. When I first gained an interest in MMA I had an incredibly hard time finding old fights.
Anderson Silva ♔
Aldo - Dos Anjos - Fitch - Weidman - Machida - Jones - JDS
NPFFL Team OHKO
Ronda Rousey | King Mo Lawal | Mike Pyle | Joe Lauzon | Nate Diaz