I've been a member of a vbulletin based forum for 2 years come this August, and I've gotta say, I love it. However, there's just one thing that's gotten on my nerves, as well as a few other member's of the forum I use. With the reputation system that vbulletin provides, when user's rep inflates to higher amounts, they have a very high rep power towards other users. Thus, these users are apprehensive towards repping or derepping others, and thus don't do so. So, my suggestion is that vbulletin allows reputation to be spread in parts, and users can decide how much reputation that they have can be given to a given post.