Mhhh... I don't know if this is a good idea.

Reputation makes sense when it comes to transactions, but for content only it doesn't provide more information than can be obtained by reading. Actually I think it's likely to lead to abuse, either to damage or improve a user's reputation. It will quickly establish biases and prejudice towards users as well because the importance of every post will be evaluated based on the user's reputation, giving less attention to the actual content and disregarding the fact that even low rep. / high rep. users might also post quality / crap content.

As a result it will make conversations in the forum more one-dimensional and superficial. People will read less and will pay less attention taking the reputation short route.

ya.ya.yo!