I took that as more if someone is critcizing the N900 that, the sell X to buy Y is not an appropriate response. Of course all moderations will have to be done via context.

And from my experiences (on both sides of the coin) IP banning is pointless. There are so many ways to get around it, so unless there's a system that requires new posters to wait a week. Or maybe have their first ten posts manually approved the only thing that will happen is new accounts being made over and over.