WP Comment System Destroys Your On-Page SEO

The problem with the wordpress default comment system is that it adds text to your page/post. So if you're trying to rank for "how can I lose weight fast", and 60 people in your comments ask "hey paul, how can I lose weight fast I've tried blah blah blah", then your keyword density for that term shoots through the roof and kills your on-page.

I'm pretty sure disqus does not do this, but you're not exactly anonymous with them when they tie every site you have to a single IP.

Does anyone know a work-around for WP, or another comment system/advice for this problem?

Hmm have you tried out the Jetpack Comment System?
http://jetpack.com/support/comments/

Well if you are that much cautious about KW density, why not edit the comments and remove the main kw? WP allows you to edit the comments.

this is why i stop using wp comments, a lot of bugs and security issues, spammers ,trackbacks attacks,,etc...

use third party comments , ex, facebook,disquz,livefyr

U have choice, just go and try with Jetpack Comment System

There are a lot of alternative plugins out there. You should give them a try!