I can check tomorrow for shure, but as far as I know OiNK IP bans major offenses (Faking client IDs, ratio faker thingies, etc), but doesn't for minor things like rato issues. However, my evidence for the latter is pretty old so maybe they are IP banning everything. I will check. However, I DO know that you don't get in trouble if your invitees fuck up. It's their problem, and theirs alone.
I'll ask Mr Mod tomorrow about the IP bans. Seriously though, it's pretty easy to not get kicked off. I have only uploaded 3 albums ever, and I've got nearly 150GB up. Just leave the torrents running and don't be a fool.