I would love to see their metrics. I would imagine, like most things, they have a ton of whales so that even if a minority of guys subscribe to 50 girls there probably are plenty of people with addictions shelling out $500 or $1000 a month on this stuff. And this people could represent the majority of all payments on the site.

It also seems (from actual published data) that the distribution is super weighted towards the top performers. That being said, even an extra 1k a month is pretty sick for posting topless photos if your regular income is less than 40k or you are in school.