I think you know the answer, of course owners have thought about it. If you got a carbon mast, with less weight aloft, your boat would have a better righting moment which would effectively give you a stiffer boat which is a positive. The main negative is that you would never get the investment back when you sold your boat. You wouldn’t be a class boat and couldn’t race with it in class events with the carbon mast. It would help in handicap racing, though they would adjust your handicap accordingly.