This is an angle I usually don't consider when I bash Creation Club.
We don't know how much it costs to run Creation Club, but let's use Wikipedia as an example. In 2025, Wikipedia spent $3.4 million on hosting. Creation Club launched at the end of August 2017, so that's roughly nine years. If my numbers are correct, they're making $3 million a year — and that's a stretch, considering how bad the console market is currently. If their hosting expenses are similar to Wikipedia's, I doubt it's bringing in enough money right now to justify it.
Other costs include curation, but they allow almost anything to be sold there, so I doubt it's much. Bug fixing? From what I've seen, they don't fix them. So the costs are probably strictly for hosting.
I will concede that it is probably cheaper for them to pay 37.5% to modders than to hire someone full-time to produce Creation Club content.