I think, by offering unlimited scrubs, they are gonna have to get their act together.. If they do a bad job, they will get the rib/boat/yacht back 5 minutes later. In principle, its a good idea.. Especially for those of us who want to keep the rib in the water all year round, and use it all year round, but don't have the option of launching and recovering whenever we want to.
Mebbe the Cornish barnacles are a hardier species than the Solent barnacles, the one's on my hull came off quite easily with the use of a car ice scraper..