Part of it is luck, but you can make your luck yourself. As many of the others have said, quantity matters. You have to have a fairly large array of well-written hubs on different subjects to start hitting a wider group of readers.
Social networking: Facebook, Twitter, LinkedIn, and emailing links to your friends and family are all important. Shoot, one hubber pointed out that MySpace is still a great place to post about music subjects.
Don't be afraid to go re-work your hubs if they don't seem to be working; delete them if they aren't fixable. I took a look at all of your hubs and the two that seemed the most likely to generate the most traffic are the McDonald's piece and the one on Stereotypes in advertising. You might expand them, reformat them, or write sequels to them. Put the link to the new one in the comments if you do that.
On your Stereotypes piece, you don't have spacing between punctuation and the next sentence. Go back and fix that. It had good content and good feedback, but running everything together was hard on my eyes.
I joined December 25, 2011. I made 14 cents in December and am sitting at $4.65 as of today, January 14, 2012. My original goal was a hub a day. Now it's 1000 hubs before year end. The more you write, the more you have a chance to get noticed. That notice may lead to a HubNugget nomination, a Hub of the Day award, or simply more traffic.