There are several ways to make money on Hubpages.
* use hubs to sell your writing, as I have with references to my books in some of my hubs
* affiliate marketing if you can make it work without getting a spam penalty assessed to your Hubs
* selling products via the Hubs and making money for it, though this is harder since eBay has been removed from hubs
* write quality content with excellent SEO so you get a lot of views that result in advertising revenue from clickthroughs