If you want people to stick around, and you're brusquely denying their points until they do hours of work to prove them, they're going to view lesswrong as a source of stress. This is not likely to encourage them to return.

This has been my relationship with LW over the past year or so. Almost everyone here is quite nice, but there are a few 'power' users (for lack of a better term) who essentially skim over all the latest comments and threads and make quick responses without understanding the arguments at all. Or worse - understanding them, but using minor flaws as justification for complete disagreement.

Slashdot has a very nice system where those who spend too much time on the site are not given moderation points (they aren't allowed to up/down vote anyone. Not that votes are that important anyway, it's just a kind of psychological de-incentivization). Maybe that system should be considered here.

EDIT:s/few/a few