Yeah, that's not really rep "abuse".
Things* that are not allowed and should be reported-
-Leaders holding loot hostage for rep/comments
-Organizing intentional no-show sign-ups with friends to get "free" rep
-Habitually downvoting anyone with a higher rep than you, regardless of their performance
*This is a partial list
Basically, if you are being rated up or down for any reason other than the rater's honest evaluation of your performance at that event, that is rep abuse.
Things that are hard to police, but I personally don't like:
-Creating 3-4 extremely short bosses (Ony, Maly, OS, etc) as separate events and prioritizing inviting exactly the same people to each