> The hikikomori[1] or NEETs ought to be a hotbed of creative works if your hypothesis is true.

This seems a non-sequitur. People whose motivation is isolation are unlikely to try to generate anything for other people.

But your general idea is correct - is there group where motivated people don't need to worry about money?

Well yes - we see this in artist colonies and indeed in entrepreneurial retreats like https://www.recurse.com/