There's no "Poor end" any more. When we decided to retreat before The Caravan Park People (hereinafter, and for always referred to as the "CPP") we joined a queue for Abingdon Marina. By the time a hole became available their rates had risen to within a gnat's whisker of downstream prices. After one factors in travelling costs, even ignoring "opportunity costs" (time and hassle to get there), it actually worked out more!

There are so many boats in marinas that never go out, nor are used as weekend cottages, and as many again which are only used for one annual holiday, that I wonder if sooner, rather than later their owners will realise it's just not worth the candle.

Then, and only then might prices fall (in real terms).
It's a matter of supply of demand, local planning NiMbYs strangle the former but lots of the latter.