Why sellers order this
Control. You decide what to fix, who fixes it, and what you pay. You get contractor quotes on your own schedule instead of under a deadline with a buyer's credit hanging over it. And you find out now whether there is a genuinely expensive problem, before you have priced the house as though there is not.
Pricing the house honestly
Knowing the condition lets you price with confidence and defend it. If the roof has four years left, that is a fact you can address in the listing rather than an ambush during due diligence. Buyers reward sellers who are not hiding anything.
The repair conversation gets shorter
Deals fall apart in the repair negotiation more than almost anywhere else. When you have already addressed the significant items and can hand over documentation, the buyer's inspection tends to confirm what you disclosed rather than reopen everything.
What it does not do
A pre-listing inspection does not replace the buyer's own inspection, and it should not be presented as though it does. It is your information, used to prepare. Most buyers will still hire their own inspector, and that is normal.
Turning the report into a listing advantage
Sellers who handle this well do three things. They fix the safety items, because those spook buyers out of proportion to their cost. They get written quotes for anything large they choose not to fix, so the number in the negotiation is a contractor's number rather than a buyer's guess. And they make the report and the receipts available during showings. A buyer who can see that the seller already looked, already knew, and already dealt with it tends to trust everything else about the house.