Thanks for chiming in. I’m always looking forward to new features on SailboatData. The “favorites” feature would be very welcomed.
I’m sure many, myself included, feel it would absolutely be fair for you to get some return on your hard work. Your site has become the Wikipedia of sailboats after all. In my case, I’m not a commercial user, but would be willing to pay a reasonable amount for refined searches with customizable results (say, in a CSV format?). Perhaps a monthly access fee?
Speaking of Wikipedia, maybe you can follow their model and ask for donations. (On the other hand, us sailors are notoriously cheap, so good luck with that…)