They also need to reach an audience. How likely is it that a content creator with a niche interest will find m/any people on nostr? And how many people out of those will click on their patreon/paid subscription/buy me a coffee thing link? It's partly a numbers game.

(I'm using 'content creator' here but I think this has become a genre to itself, I'm still using it in the more old fashioned sense lol. There are definitely people online doing very worthwhile projects and not solely / cynically harvesting clicks and ad revenue).