Can you sell a survey to the next
The person who payed for the survey "owns" the survey report and can do with it what they want.
Review your contract. I just looked at the YBAA standard form and it just says that the buyer only has to notify the seller in writing whether they are accepting or rejecting the yacht, it doesn''t say that the buyer has to specify why.
When I bought my boat, the seller had had an informal survey done, and the broker did tell me about the results and showed me a copy of the surveyor''s sketch of the deck, but when I asked if he could make a copy of it for me, he deferred saying that the survey was the property of the seller and I would have to ask them.
I don''t know what kind of legal requirements for disclosure sellers and brokers are bound to, but I''m sure full disclosure is part of the ethics of the yacht broker''s association, so they would be expected to tell other prospective buyers that the boat did go to survey but you decided not to buy it.