By boat standards, J/30s are pretty cheap to buy. I would think that the majority of people buying them to race will spend most of their time handicap racing (PHRF in the U.S.) and therefore feel that the class should do what it can to make them as competitive in mixed fleets. Hence Bill's suggestion is a good one. When we meet as a Class for National Championships, we can set whatever restrictions we like (with a goal to increase fairness and participation).