YES...
Every marina we have berthed in, have had at least one residential moorer and in all cases these people are invaluable in terms of help with information, always being there to take your lines when the weather is bad and, of course, the very valuable additional security. We have in the past exchanged mobiles, so that if there is ever anything amiss at weekends,they can contact us.
However, I think one or two in each marina is enough.