None. Back in the day i bought all of them, then it slowly got less and less until i was buying maybe one or two a year.
Ever since the UFC started focusing more on entertainment than the best fighting the best and showing a total disregard for the fans, i started streaming.(illegally).
Once i got good at it, and figured out the package is far better than what the ufc is actually offering i havent looked back.
Now i have access to literally every event that has ever existed in all the major promotions on-demand. New events are live and available for replay within minutes. And its all "free". I dont see me stopping unless im forced to.