Precisely my point. The owner is supplying said traffic and the advertiser is demanding more product sales. Who's job is it to do each of these? It seems as though the advertiser is forgetting one important detail. They have to have the traffic to get sales. You can't predict who's going to buy. You have to sell your product or service not the traffic supplier.
Let's say all names showed a generic landing page with mutiple categories. I somehow or another end up on this page. I might have been looking for one thing and while there I get curious click on soandso's link. While doing so I find out about a company, product, or service I didn't know about. I wasn't really looking for it but hey it's nice to know it's out there for when I do decide to buy whenever that may be. The person who referred me to this site gets nothing in return if not a PPC search. Sure in a perfect world I'm going to whip out my credit card and buy but most likely not. And you can't count on cookies to hope to get a commision for a sale down the road.
Sure you can get direct and extremely relevant type-ins and as I pointed out the best of the best type-ins are most likely going to be savvy shoppers. So you pay more for someone whos looking for the cheapest deal? In Edwins senario although a good idea it would take a mathematical genius to figure out a payscale for each and every particlar domain parked.
All in all, if not PPC what does a traffic domain owner need a middleman for? Bundling up their related traffic and selling it the old fashion way would be more benefitial. Or signing up for the thousands of affiliate programs already out there for that particular category and determining on their own which works best and who actually pays.
Now that I think about it. Let's stop using the term PPC altogether. It should be called PFP Pay For Positioning. Thats essentially what you're getting. If an advertiser doesn't want to Pay then they can go play the SEO game and pay dearly for it with only hopeful luck.
And just so everyone knows. Parking income accounts for probably less than 1% of of my income so either way it's no loss to me.