Hello,
This will be my 5th year of having a boat on a mooring.
One time during my first year, I went to my boat, and noticed the mainsail cover was tied on rather differently than I had left it. Later, the guy right behind me told me that during a windy evening, my sailcover started to blow off and the main to come loose. Fortunately for me, the owner of the boat head of me was on his boat, saw what was happening, went to my boat, and secured the sail. I left a case of beer on his boat the next time I had the chance. A year later I really repaid him. I dingy'ed to my boat and noticed his was really low in the water. Peeking through the ports I saw water over the cabin sole. I notified the marina, they called him, and he came out and fixed the bilge
pump (it was an older wooden boat with a lot of leaks).
Since that time, I have helped (and seen others help) a few boats when I saw loose headsails, chafing mooring pendants, etc.
In my harbor, I haven't seen the marina operators help, but I have seen fellow boaters help.
IMHO, you are expecting too much if you think the marina operators will do anything to help your boat. When you're on a mooring you're on your own.
Good luck,
Barry