In the yards I have used, the employees who are exceptional are recognized by the yard and their fellow workers for their skill and are compensated accordingly by the yard. If they are not, they will be recruited at higher wages by other yards. This means that the market adjusts wages to reflect the work performed (not perfectly, but mostly true). My personal experience with exceptional workers is that they appreciate the boat owner's recognition of the quality of their work, and are not seeking separate compensation since they are already compensated more highly than their peers.