HubPages splits the impressions with you in the following way:
Your own Hubs: Hubbers receive 60% of total impressions.
The HubPages Affiliate Program: You can refer new writers to HubPages and if they become Hubbers within 30 days, you receive an additional 10% of their Hubs’ lifetime impressions.
Traffic Referral Program: If you send traffic to any Hub, you’re entitled to either 9% or 12% of total impressions. You’ll receive 9% if the Hub you’ve referred people to already has impressions allocated to an Affiliate. If there are no Affiliates, you’ll receive 12% of the total impressions.
Here's more info on how to use HubPages Referral Trackers - http://hubpages.com/community/How-do-I-add-a-link-...