I just join about 4 weeks ago wrote 23 hub and from about 1000 page views I got about 3.15 USD.
What I notice that , if I stop writing my traffic drops and my earning also drops.
So, I try to write a hub every 2 days once. If you could write more better.
Plus I have one article about solving iframe injection which is driving traffic to my other hubpages.
Plus, traffic that I am getting from hubpages is much more better.
My iframe injection hubpages is ranked higher of the same article which I wrote in blogger.com & makes more money.
Hubpages is a good platform for you to make money in long term. Plus, you could integrate other affiliate settings easily.
Now I am writing for fun. But if I can make money on the way why not :)