Having been in the real estate industry for over 14+ Years I have only shown a home 1 time and most of or just about all of my buyers come over the net. What people want is to know if the home that they are buying is a safe  buy and that can is done with the aids of professional people along the home buying routes, With the aids of the net and the fax machine and if the listing agent has done a good job of a digital  out lay of pictures there is no need to leave your office and drive around with the high price of fuel.