London is crowded, go by bus, it's crowded, go by car, it's crowded, why would it be any different by boat. There's lots of peaceful empty room in the countryside. The myth that overcrowding on visitor moorings is down to the liveaboard community has been debunked so often you'll have to find something else to sneer at. And yes, it is a community in London it works exactly like any other community. I suggest you follow the Facebook link above if you want a flavour.
I also suggest if you are having difficulty boating in London ( I never have) you put pressure on CRT to provide more facilities and stop trying to blame someone else.