Greetings, Rates are adjustable by the ads network that is paying for the traffic we send to them from our users websites. GO Unlimited ("The Service") is just a "middle mane" in this process. Their rates depend on several factors, such as the amount of demand (advertisers) and the amount of supply (publishers), when the amount of supply is high and the amount of demand is low, the rates are reduced dynamically, and the opposite. This dynamic process affects all users of the advertising market and not just our service, as you can see all our competitive services provide similar or much lower rates. However, Tier 1, 2 and 3 isn't affected in this situation. Best Regards, Josué Chagnon.