Are you in the HubPages Ad Program? If so then you should be earning a small amount each time someone visits as that is based on pay per view. However, if you have adsense instead then most of your earnings will come from traffic that comes from Google - so check your traffic sources. If you don't get Google traffic then you might have to work harder on your keywords - use Google's keyword tool for checking which have low competition and high search volume.
For example - looking at one of your hubs it is called 'Tics and toes of starting a business' - what does tics and toes mean??! I have never heard that and it doesn't come up in Google when I did a search (apart from your hub!) so possibly not a good title.
There are loads of hubs around about maximising traffic and using better keywords so have a bit of a dig around. Good luck.