though I'm a libertarian: 100x100 on the WSPQ[http://www.theadvocates.org/quizp/index.html]

Well, I score 90x60, the left-wing side of Libertarian, so it's not like I disagree strongly.

the positions that are generally agreed on by economists

...most of which I also agree with. It's the points where economists frequently disagree that I am left to assume that most of them have no idea what they're talking about (As for taxes, that's a much more complicated question than just wanting "more" or "less" of them).

Of course, it would only work if one or a few people who disagree with the majority position were committed to making their best argument and sticking to the discussion even as they get (predictably) piled on by others.

And this is the real problem, because my views differ enough from most standard positions that I'd be arguing with a lot of people, but don't differ enough to make it feel worth arguing because collecting and organizing supporting references properly is a lot of work.