Home deals fall through all the time simply because the seller did not take time to find out the condition of their house before putting it on the market. Eventually your buyers are going to conduct an inspection. You are in a much better position knowing what they are going to find before their inspector does.
The Advantages of a Pre-Listing Inspection are Numerous:
It allows you to see your home through the eyes of a critical third-party. It helps you to price your home realistically. It permits you to make repairs ahead of time so that defects won't become negotiating stumbling blocks later, there is no delay in obtaining the Use and Occupancy permit and you have the time to get reasonably priced contractors or make the repairs yourself, if qualified. It may encourage the buyer to waive the inspection contingency.
It may alert you of items of immediate personal concern. It reduces your liability by adding professional supporting documentation to your disclosure statement. It may alert you to immediate safety issues before agents and visitors tour your home.