Not so much links to other sites. You must provide alternative links to ISPs that aren't loaded with referral codes and inform prospective broadband customers exactly why there are two sets of links and which is which. That way, customers have a choice on whether they finance this site or not.
However, a prominent, honest and open disclaimer that fully explains the mechanics and ethics behind this site should negate the need for such duality.

Such honesty would generate a lot of goodwill toward this site and that in turn would generate much more traffic. On the other hand, hide the fact that referrals etc are the order of the day and that will be discovered and it will be made very public indeed. I can't think of a better method of driving away customers than very widespread publicity of the worst kind.

At long last, my weekend is about to start. :)