Some people make a car payment, a few who are crazy prolific can earn full-time money. You need...
1) LOTS of Hubs (100 absolute minimum, many more better).
2) Hubs are commercial (product or money making related).
3) Hubs have many links from outside HubPages so Google thinks your Hub is important.
See my profile and look for the Courtney Tuttle link for more details.