To be frankly here; domain parking is no longer profitable. Because of the token of about 5% or so shares, they usually give to you as the domain owner, from every click. But the best of them now is the Google adsense, that gives the best share from clicks. However, the main focus of Domainers in the recent time, is to park domains for developmental purpose. Such domain parking can only be achieved on web 2.0 types of parking sites. For example . You can park with them and get adsense code placed on your domains. But the problem with adsense is, they can ban or suspend any account, any how any time. Cheers.