It's great to see discussion on a topic that seems unique to the Chesapeake District, yet watched by others all over the country. Other than trading off the cost of diving to clean the bottom over time versus the costs of a lift, I never understood if dry sailing offered a racing advantage over a properly prepared and cleaned bottom. My only experience with dry sailing was dinghy's.
I hope this discussion and vote encourages maximum J/30 participation in one design events.