My survey cost $16/foot, but I am in California - it was more than I wanted to spend - but in the end it was worth every penny. I found out some things about the boat that the owner had not mentioned (there is a
oven and
stove, but they are not hooked up to a gas tank and do not work). This allowed me to get the boat well under the asking price and also made sure I knew what I was getting myself into.
I would recommend it for anyone. (And I did need it for insurance anyhow.)