The top earners on OnlyFans make a lot of money indeed. There was recently a great interview with Amouranth [1] where she talked about her work.
Making $1.4 million per month and growing, has 4 employees, outsources every chore she can, posts content on all the social media platforms, and grinds 12 hour days on Twitch. [2] Doesn't spend most of the money, is learning about and trying out investments.
Interestingly she doesn't think that this type of top-heavy earnings situation will be sustainable, that the revenue will be more evenly distributed in the future. Even so, she considers her biggest competition to not be up-and-coming people, but instead existing influencers who might bring their audience to OnlyFans.
Definitely not a common success story, but it's pretty interesting how it is possible to have insane success when applying well-reasoned growth strategies and keeping up the grind.
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[1] https://investmenttalk.substack.com/p/confessions-of-an-only...
[2] In the linked interview she still says 8 hours for Twitch, but she has stepped it up since June.