Public access allows some one to keep a boat in a harbor for reasonable fee. It can include a place to park your car as well. That's pretty much the support system for Maines fishing industry that has been a part of it's harbors now for generations. Backed up by town owned water front on many harbors, we're insured for the future.
Without that, the cost to keep a boat goes up and up with the high cost of owning the waterfront privately. In southern New England, shoreland is much higher valued than Maine. Without public access, marinas are your only choice and they will have to hand off their high cost of doing business on the water.
We have a good thing in our public access to the water. Many of us are drawn to Maine, to live, by the sailing.