There are a lot of things that can be implemented, but require more work and possibly more mods.
But from the forums I've been on, there are no Reputation systems at all (while a few do). If you look around, you'll see people noticing more of the post count and title under their usename than anything else. When I first joined a car club, the first thing that catch my eye on various members are their title status. If they're Guru, Senior Member, etc. Those show that they are more willing to help and reply to threads than the newbies.
Also, post count helps to reinforce that seniority. If you compare someone that has a thousand posts and someone that has only 20 posts, who do you think are most likely to reply to threads and help out? Of course, it's the ones that stick around the longest. A Rep system is all right, but there are other contributing factors than just that.