I think the point that is being missed here is that it is the Buyer or Seller that has to be satisfied with the inspection. The marketing should be to the Consumer as well.
If Sellers took the initiative to have an inspection (or were encouraged to do so) they not only would know what to expect in their real estate transaction, but would have the ability to correct or consideration what negotiating etc they need to be prepared for when they do have a Prospective Buyer.
Disclosure brings everything into realistic view, and when it is after a Buyer is interested or at the middle of a real estate transaction it can have a severe squelching effect on the entire process.
Don't get me wrong here, I think that Buyers must arm themselves with their own personally selected Inspector as well. They have a different agenda then the Home seller.
The Home Inspector as a generalist can give either party a realistic expectation and great information for them to be empowered and make an informed decision regarding their Home (whether Seling or Buying)