On Mon, 07 Dec 2009 11:34:07 -0700, slide
wrote:

permanent liveabords who get some
wreck of a boat and moor or anchor it as a solution to cheap rent.

That is the crux of the problem right there. It gets worse.
Eventually the boat becomes abandoned for one reason or another, and
then it sinks, creating a navigational hazard and eyesore.