You can add your referral tracker to the url of any hub and gain a percentage of the impressions the hub receives for a period of time.
Fortunately, HubPages creates the url with your tracker in it for you. All you have to do is click the "Share" button at the end of a hub and then click "Link to this page" in the first column of options, ad voila, there's your url with your referral tracker included.
You can "anchor" text in your hub with this url and create a live link, which is how I use it. In other words, highlight the text you want to anchor in the text capsule, then click the "link" symbol in the text editor toolbar and paste in the url. Hope this helps.