I find that when I first publish a new hub I get a lot of HubPages traffic. Then, after the hub isn't really 'new' here anymore, the HubPages traffic dies down and then it's a matter of waiting for the search engines to catch up with my Hub (can you say backlinks?). Then I start getting the search engine traffic. That's the traffic that's more likely to make you money, if that's your goal.
Meanwhile, it seems that if you make changes to a hub that you already published, you will get another pop in HubPages traffic.
Good luck with it.