Why not populate your site with (fake) ads from well-known companies to make it appear you were successful?

Suppose you sell some sort of car parts on your web site. Add in advertising banners from GM, Toyota, etc. that takes the user to the banner's site. Then, when you're off looking for real advertisers to pay real money, they see all the big names advertising and want in on the action. Sure, it's a bit devious and potentially illegal, but that depends on what country your site is hosted in, does it not?