[quote name='John Swallow' timestamp='1346960915' post='2305791']
It's an interesting idea worth investigating further. But the person would soon find out they're been passively banned - what if they log in as a guest for example and see all their posts missing? (Well, I suppose you could show them to guests still, on the basis that guests wouldn't be able to reply).
In my eyes, it's a bit of a sneaky way to ban people (like making people "miserable" is). If only there were a reliable way to ban someone for ever.