Yes, there are major benefits. For every person you refer to HubPages, you earn 10% of everything they earn.
To earn referrals you need to create links that include your referral tracker in links to HubPages. First you need to find your referral tag. Go to the "My Account" section of HubPages. Then click "Earnings" from the options along the top row. Then on the left menu, click "Referral Trackers."
You can use the tag you are given or you can create as many as you want. This comes in handy if you want to track where you are getting your referrals from. I recommend creating a new tracker so that your link doesn't look horribly complicated.
Open a notepad document and paste any HubPages link you wish to direct traffic to. As an example I will use the Sign Up Page:
Then add your referral tracker after the "hubpages.com" portion of the link. For example, if you tracker was "ReferralTag" it would look like this:
**Note: If you click the above link it will not work because I had to change .com to .con to follow the HubPages rules.
Make sure you include the underscore before your tracker! You can do this with any hubpages link. Let me know if you have any other questions.