You might consider however giving the moderators the ability to get together once in awhile to select a few people with consistently good posts (well thought out, polite, useful, etc.) for some other tag. e.g. Trusted Agent. Maybe have to be a supporter as well to be considered for the honor.
There are definitely some people here that are very good at helping people out and I think that they deserve some recognition as well as a highlight that lets others know they are worth listening to.
Might consider a thanks/post ratio requirement as well.
Ever visited us in Heidi and Lionfish thread? The expression: unintended consequences comes to mind! Watch what you wish for.