Personally I would do like RailsCasts.com and ThatGuyWithTheGlasses.com (now ChannelAwesome.com), two sites I frequent, did... offer pro accounts.

Pro accounts could:

1) remove all advertising from the site. 2) have access to content early like drafts of upcoming articles 3) have access to revised or updates to articles 4) allow people to recommend articles

the list could go on, you'll probably think of a thousand things that I couldn't since I'm not in marketing.

At first, I was wondering why not just sell the business? Who knows, you might have tried? After thinking about it some more, since it's your baby--why take the chance of letting some with more money than taste/knowlege blow it up? I understand your decision to close it down. I hope you keep talking about the efficacy of Internet advertising--the real truth. I'll follow you on Twitter.