It's certainly a lot compared to other fediverse sites but also much, much larger userbase so the cost to run is higher.
Discussion
I doubt it's much of a loss maker plus it's how he advertises his services.
Some of them and I guess it shows that he can deliver at scale. I assumed he got most leads via Alex, but maybe I'm wrong.
He makes a big post about how you should host your own instance for the health of the fedi and how he offers hosting services if you need help doing it every time his site gets an influx of users, and we all know he doesn't give a shit about the health of the fedi given how much he defederates over hurt feelings and criticism.
There are fedi hosting services that let you host thousands of accounts for like $200 per month. Graf used to (lie and) say it cost him $3000-4500 per month, and he’d collect that much in donos.
Are these sites hosting the big mastodon instances? Basically only poast and baest are over 1k active I think over on this side. Probably kf too when it's userbase comes back...