One of the root ideas in the True Fans essay was a fan would be willing to spend a day's wage for a year's worth of content from a creator. A large portion of the population at large can pay a day's wage for say 52 hours (a creator spitting out and hour of content a week) of entertainment. Out of that population, argues the essay, a creator needs to only find a thousand True Fans out of the population that can afford the $100 in order to make a living.
That's not only workable math but something that's doable. The market can support the model, it won't always and in every situation but it can. At the reasonable "day's wage" level many people can afford to support multiple creators. Spending $200 a year for content is still in the affordability range of a large portion of the populace.
A far far smaller portion of the population at large can afford $1k for 52 hours of entertainment. It's definitely not a tenth of the $100 population, it's more likely a fraction of a percent. So any given creator isn't likely to find 100 True Rich Fans, they're going to find maybe one if they're lucky. The market isn't going to support a model where a few dozen hours of entertainment costs a thousand dollars. A thousand dollars will get you a game console, a TV, subscriptions to a bunch of streaming services, and a ton of games. Even fewer of these whales could support multiple creators so very few creators could ever possibly survive of the whale model.