I know a guy who makes all of his money leasing his domains. He purchased a bunch of domains years ago that get type-ins, but has no desire (or time) to run sites off of them. To be honest, I am not even sure he would know where to start running a site, so he just leases them out to people to use.
I suppose it is not a bad plan, they are all listed in SE's and get traffic, so if he ever does come to the darkside he will be ahead of the game
