I've seen many forums do tier rating systems for posters, so you didn't see any numbers but more of a generalized ranking from Novice to Veteran. The rank names shouldn't imply anything other than experience in posting, so avoid things like "Expert". It still gives some credence to a poster who has a high rank, but doesn't mean much beyond a flair. Much like Reddit trophies of account age...great, you've been here ten years, what did you do with it?
The argument then shifts to where the lines of rank are, but I don't think that's too important, although honestly if you can post for a month and become a Seasoned Veteran it might be too low. (Thinking of you, Frontier. Not every player should be Elite.)
The boost thing is something different. I like the idea of its supposed function, to push updated or valued content into the feeds more, but clearly the user manual needs work. Should we just have the same as everyone else with an up and down vote, where the upvote does a boost and counts towards rank, while a downvote is simply a visual of either disagreement or unfavorable content but doesn't do much (maybe drops the post lower but that's it).