I think they should have a rule that you have to be a posting member for 24 hours before you can report. Because every time someone is banned, they come straight back and start reporting again.
I'm not looking for a two tier membership, or saying that only "regulars" should be listened to, but surely it's not unreasonable to expect people to (a) be members and (b) wait 24 hours before being allowed to run riot with the report button.
Either that or a limit on reports. No-one should be allowed to join, never (or hardly) post, but report hundreds of times, get banned, return the next day and do the same thing again. It's just silly.