One way to make money from Pinterest is to pin photos that link back to your product. For instance, Etsy sellers can pin photos of their creations on Pinterest and people who are attracted to the image may click through to the Etsy shop and possibly buy the product.
Similarly, Hubbers can pin their best, most attractive hubs on Pinterest and possibly get more views, thus earning more money.
When pinning, it is important not to come across as a spammer, promoting only your own work. However, pinning others' images may likely be a copyright violation, so always make sure you have permission from the owner to pin things that you did not create yourself.