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Yes and no, BW support them because they get a 'stonkingly' high connection fee and future revenues from each one. BW hope it will clear the canal of linear moorings (which can be a bit tedious to pass at times).
No - because moorings charges are much too high and there are too many berths available, many of which remain unfilled. Marinas are expensive to develop which is possibly one reason for the high charges.
Prospective owners feel they are an easy way to make money, but in reality marinas are the golf clubs courses of the 1990's, which saw the market flooded with courses and prices for joining/playing fell quickly, so much so that many are now struggling financially.
In some instances these sporting/leisure facilities are a good way to 'launder' money.
The boating 'bubble' will burst soon as owners just do not have the spare cash available to own and run a canal boat - unless charges are pegged and made more reasonable, especially on the moorings front.
I am on a BW linear mooring at £30 a metre p.an (PPDis), no facilities and no maintenance from BW!!.
The marinas currently being developed are really huge boat parks, filled with floating cottages (few of the boats move far), it would be preferable if the size of marinas could be limited to say 100 boats which would have less of an impact on the environment, but as developers genarally try to 'cash in' by adding residential units and associated leisure facilities anything less than 300 berths may not be considered viable.
It's going to be an interesting few years watching how things develop, I would loved to see the feasibility studies the developers on the marinas incorporated into their original development plans and there must be some worried Bankers around who have helped fund these expensive 'puddles'.
BW have put on hold plans to develop 2 marinas on the Southern GU.
Leo