An anonymous reader found an article about the former CEO of MySpace moving into the domain parking biz
. He says "I thought, it can't be that easy. So I talked to some domainers, and they said, 'We own 300,000 domains, we make $20 million a year, we have just four employees and some servers in the Caymans.'"
The idea behind the business doesn't really seem any better to me than just having a parked name with a banner ad. At least, not for the internet as a whole.