nope..i can't agree. when i buy cars or boats, the seller pays, IF I BUY.
if not, then I BUY.

Well then, don't agree.

Bought many boats? (I've sold a couple of hundred).

Sea Trial is the seller's expense. Survey is the buyers. If the boat is being
launced for sea trial, it's on the seller. Survey is on the buyer.

You can ask for anything you want. It's all negotiable. My comment merely
reflects the industry norm.