I don't know. I'm a member of several private websites that, by virtue of being private or illegal or both, can't really gain ad revenue. They struggle. Constantly. And nearly every time I check them I worry that they'll be gone in a month or two. Erowid, for example, is in trouble again. Ads are stress-free. User-generated capital is transitory. And is it even ideal? hubski is obviously not under any financial burden, but if one day it was ... I'm on firefox with dark theme right now and there are two huge blank vertical areas on either side of this text box. If mk in some hypothetical future could trick a stupid corporation into paying our server costs and the only drawback was that I had something in my peripheral vision sometimes, I wouldn't mind. I might even think he was just being rational.There's really no model that I think works better than user generated. Ads suck.