Methinks I know this particular location.
My own Marina, Mayflower in Plymouth, charges £10.80 inc vat, per metre, to lift out, move to cradle and relaunch. This is what you had I think. That area that you are talking about has its own purpose-built pontoons down below the boat park, has a specialised forklift and runs a high security boatpark facility. That is its only source of income, it does not have a mooring fees income like most places. You may feel that its expensive, but like the fuel filler man in the Scillies said to me "If you dont like my prices you are free to fill up elsewhere"