Why not a pay by fight option where 50%-90% of the money goes to the fighters? So instead of paying $60 for 5 fights I can pay $15 per one i want to see.
1. The UFC wouldn't see much value in offering anything where they got a lower cut. I don't really think that would be something that would have a mass market appeal anyway. They would get a little bit of cred from hardcore fans, but most fans probably don't care where their money goes to. If there was a $15 deal, the UFC could probably take their usual cut, and sell roughly the same amount as if they took a lower cut - most customers would probably just buy because of the price and not where the money went to.
2. The UFC would hate to see current $60 paying customers turn into $15 paying customers.
I think a lot of viewers really only care about the main event, and maybe the co-main.
By offering single fights the UFC would devalue their core product.
They would lose a lot of leverage to sell entire cards to TV-networks and other stuff that they are planning
Seems like so much of the UFC is built around the idea of having one card where expensive high profile talent is bundled with cheaper low profile talent.
Sure, they would also gain a lot of new customers. People who currently refuse to pay $60 for any stream.
But if very hard to know how big that market is and they wouldn't risk devaluing their core full-card-product to find out.
By having more fans watching the main events only we would also have a problem with more and more fans losing interest in the lesser known fighters, which means it would be harder to build new stars for the future. That's one of the benefits when you 'force' people to watch an entire card.