I for one never worried about it; we have a lot of good posters on here who post rarely but when they do, it's solid. We also have a lot of hands-on owners out there who again rarely post, but when they do it's a genuine cry for information or spare parts, or a very helpful post on various techniques or tools.
It's interesting that a poster can post an entire 'how-to' with an in-depth guide and photos, another will post a link to another site with the same info, and a third will agree and post "+1" All three count as a post. I'm not envious of high posters (well I can't really be, can I ) but I'm not scornful of low posters either as I know it's quality not quantity that counts. I like a good discussion, usually get into a debate on the best way to do various things, I'm always thinking out loud on here and like the banter. That's where most of my posts come from and the corresponding rank. Going by the user names we have some members very active on numerous other forums; I'm not - this is the only one I visit or post on.
I don't go by the rank of anyone who posts, I go by what advice or help they give and that's the important thing. I wouldn't miss the rank system at all but I'd miss the assistance if we lost posters because of it.
I've mentioned the BT Forum before - Mister "try turning your router off and back on again", ranked as a 'Forum Guru' now has over 18000 posts, all with that same reply, which he posts in response to every query. I'd hardly call him an expert...