"I noticed mutiple users ratings drops when a bunch of sh'ers come over to pollute the air. When they get banned nothing is being modified after..."

You may be right - I don't know. What I suspect is happening, also or instead, is that some previously banned members have re-registered not to post but just for the ability to downgrade everyone here. I'd contact agora about it but agora didn't respond at all to my last couple of requests for info/explanation.