it’s a good idea as long as it doesn’t get abused. I get a feeling that the type of people that frequent this place aren’t a bunch of trolls or up to no good, and most people will look at post counts as well as the reputation meter.
It’s valuable also in that you may have a huge post count, but if you’ve been slinging bad advice or otherwise being negative it can also help sway opinions on how to take that particular persons posts in the various threads they are active in.
There may be a little abuse/favortism by a few members, but regulars will be able to sniff them out pretty easily. Most of the time those people get bored after awhile and stop frequenting the board anyway.
Either way I think it’s something fun to add to the board, an incentive to keep members active.