I've looked at several boat that are for sale that have all had recent surveys (paid for by the owenrs). They have offered them as part of the effort to sell the boat. I just read one from Steven Bake. When you read detail like "The deck equipment was inspected. The anchor has a slightly bent shank" you know you are having a guy that is paying attention to detail.
He found something on a boat that I was looking at was very mportant to know. He told me exactly where to look and it still took me 3 X to find it.