This is an interesting argument. However, I don't think that Realtors only offset their fees by adding value to the pricing of a house. As a matter of fact, it flies contrary to the reality of the market at any given time, and now more than ever it is clearly a misconception that such is the case. A trained and experience real estate professional functions more like your counselor, your advocate, your eyes and ears, and someone who will do all within his/her power to make you the most money, and avoid the biggest challenges and do it all in record time. As for what that may be worth, THIS IS ENTIRELY NEGOTIABLE (by law).
Study: No Reason to Pay Realtor Commissions When Selling a House