Besides the obvious falsehood that being attractive is being 'born attractive', onlyfans and such sites are full of very attractive people who suck at marketing, customer engagement, etc, who essentially make beer money being naked (with the hope that things will spike up 'real soon now').
The people at the top have a lot of hard-work, skill, and "being born attractive". Sex work is work.
Someone attractive can have the charisma of a dead fish.
People will pay for that
Would you rather pay for a boring hot person or an interesting hot person?
I personally find that super attractive if they lack all skills and intelligence and their only redeemable feature is being hot. If I was the type to pay for OnlyFans, I would certain shell out for a girl like that.
Like a lot of businesses in the addiction space, cam workers make a lot of their money off whales. So the profit comes from high effort relationship maintenance / customer service.