It's interesting to me that you reject 4 and 5 out of hand because "you don't like ads." I think most people don't like ads because they're intrusive, bandwidth-heavy and decrease your agency. No one, to the best of my knowledge, has made any effort to ask what sorts of ads people want and then go with it; it's always been about charging advertisers enough that it's worth annoying your userbase. The tides are shifting on this: Google had to mark their prices down by 20% this year because the effectiveness of Adwords has gone down substantially. The ad industry is going to experience some major changes soon and rather than say "there is no way this can ever be made palatable ever therefore we will refuse to even model it" it might be effective to examine a way to make a noxious something less noxious. You might even be able to license/sell such a system 3rd party.

I also think it's worth noting that your reaction is to "things I think will work", not "ideas I think you should try." I'm not sure about the outcomes of any of these, but I think anything you learn from trying them teaches you more about paying for the site without losing your soul.

Especially since you haven't learned your lesson. Micropayments are stupid and will kill your site. I don't want to see the intrinsic value of a post of mine, particularly when it comes down to "you just spent 20 minutes typing out 2 hours worth of reflections and it's worth less than a tenth of a cent." The very mechanics of your idea are telling me to fuck off and do something better with my time.

Before you do anything else involving "payments" and "social interaction" read the Ariely book. It's not that you haven't figured out how to make it work, it's that perpetual motion violates the 2nd law of thermodynamics.