Seems to me your logic is a bit flawed. Totally agree that whoever caused you the problem with wash was idiotic probably verging on being dangerous. But why should his stupidity result in me paying higher costs for my fuel? You should have reported him to the harbour master.

It's a bit like me saying ban all yachts from a certain place cos someone in a small dinghy has tacked straight across my bows in an area of resticted manouverability or yet another dinghy has scraped down the side of my boat on my mooring. Oh yes, some of us do reside outside marinas!