It takes time to grow a following and increase earnings. From what I have observed, it could take up to six months to earn enough for a payout. I have been here 3 months, and I have seen an increase in my earnings each month. I haven't hit the payout stage yet though. This is not a site where you will get rich quick, but it is a welcoming community of supportive writers. The other thing to consider is your hub topics. Some things will be more popular than others, and therefore, some hub articles will earn more.
Read and comment on hubs. It will get your name circulating out there, and more people will notice you and read your work.
One more thing... I have noticed that when I am not publishing for several days, my hubpages reads go down (logically), but my google hits keep rising. It takes time for your hubs to get noticed by the search engines. Again, be patient. It takes some time and energy to build your earnings. Good luck.