Hubpages is making all of the money from the ads on your hubs. Hubpages didn't create a place for us to blog for free, you know. I know folks on here who write outstanding hubs all of the time - and they never joined adsense, for one reason, or another.
Or are you saying that you set your hubs to "non commercial," and they still have ads on them?
If you had an adsense account at one time, and you lost it, or canceled it - or whatever, then Hubpages is making the money from the ads. They have to pay bill too, you know.