No you don't earn cash for unique visits to your hubs, but only when someone clicks on the ads shown on your hubs.
And as Arun kuruvilla here says, DO NOT click on your on links, google may ban you from using adsense.
Also you can earn from ebay, amozon etc. Procedure is the same as adsense, u just have to sign up with each of the given sites and have to enter the ids in the space provided.. Done!
Hope that helps...