A prepurchase survey, not a C&V survey
A "condition and value" survey is only a cursory survey to determine two things: whether the boat APPEARS to be worth the amount being financed or insured, and anything that actually endangers the boat. Whether the systems are in good condition--or even whether they work at all--is immaterial in a C&V survey. The hatches can leak like sieves...as long as the boat isn't taking on water below the waterline. The holding tank can leak--it doesn't threaten the boat nor add or detract from its value. A burner on the stove may not work, but as long as neither it nor the propane tank are leaking gas, and the propane tank is stored in a properly vented locker, it doesn't affect the basic value of the boat. The boat can desperately need bottom paint...have blisters...etc., etc. But as long as the OVERALL appearance is good and there's nothing wrong that's likely to cause it catch fire or sink, that's all a lender and insurance company want to know. In fact, a C&V survey doesn't even always require a haulout. That depends upon how long it's been since the last one and the individual lender's or insurance carrier's requirments. Otoh, a full pre-purchase survey includes every inch of the boat, and finds all those things I just mentioned that can cost you as the buyer money to fix if you don't know about them before you buy the boat. And it costs about twice as much as a C&V because it takes at least twice as long to do.