Even ignoring the model censorship making high quality sexual imagery/videos not possible, this is a crazy take. You think OF models are making money because it's the only way to see a nude man/woman with particular characteristics on the internet?
You're completely misunderstanding what the product being sold is.
Their point is that the point of OF is that there is (supposed to be) a real human. It's a (para)social relationship that no image generator model is going to give you.
If you can make X money running one client at a time you can make ( X × N ) money if you work with N clients at a time. You have to give just enough human to keep'em hooked.
You're completely misunderstanding what the product being sold is.