We all like to boast to friends and be like "dude i got this much ..." so if the rep system was brought back it could encourage players to make better posts. It can also, kind of like what redundant said when looking at advice given by people whether you can trust the information given to you or not by checking someone's reputation.
With the return of rep (theoretically speaking), it could open up maybe a staff position of dedicated clearly to the soul purpose of moderating rep. Example a new private board created, that shows all rep given to users constantly refreshing, like the torispy feature (this could cause server/site lag) in which case it could be more than 7 rep given to a user in less than 5 days. Then the staff position by whoever is checking this, when something comes up on a weird user, or any user, the staff checks posts from the user who received the rep, and then checks who sent it. if a problem pm a smod, if not, let it go. that could be one way of solving it. Of course, people requesting rep get warned,infracted,banned