It's difficult to answer this question, some topics are more likely to generate more traffic than others and some topics are more competitive than others.
It looks like most of your hubs are about SEO, and Social bookmarking. I think these topics are fairly competitive so it will be difficult to generate a lot of traffic from the search engines unless you found some good keywords.
To get a feel for what kind of traffic others are generating you can check out HubPages Stats. www.hubpages.com/stats/