Illustrated by the other side of the coin, boats on that site available to rent. There is just one, a nice-looking cruiser for £1,200 a month. Its in a nice spot on the Thames at Chertsey in, I think, the weir stream. From memory it is miles from anywhere to park the car and a two-bed house in the same area can be rented for the same money.
The boatlord makes it very clear in the listing it is for living on not cruising around. Good luck with that I find myself thinking!