There are people who invest their money in boats. New narrow boats are being produced at a high rate. The only problem is that the supply of moorings is not keeping up with the demand. BW and public enterprise are creating many new marinas but finding suitable places 'off the cut' and getting planning permission takes time. Some boaters are able to travel around the canal system and don't need a mooring.
There are also people looking for cheap second hand boats to live on. They cannot afford to buy a house these days. BW and private land owners provide moorings 'on the cut'. Some boats taking up space on the canal don’t display a licence. BW are not really doing enough to control this growing situation.