In my view significant items that were undisclosed or undiscovered prior to survey need to be negotiated regardless of offer price. There is no such thing as an as is offer. Buyers make offers based upon what they know. Surveys are conducted to learn what may be unknown by sellers and buyers.
Dependent upon offers are the little things. If you are giving all the money for the boat then you should get all the boat. If you are giving some of the money then you may be willing to accept some issues. That is the gray area and every deal is different.
Surveys occasionally end with the discovery of "showstoppers". Sometimes the deals just fall apart from all the little things adding up to more than a buyer can stomach.