When looking at the value of using a CSS, we generally ask merchants to look at their average CPCs and their average clicks over a set period of time, rather than asking “have we saved 20% on CPCs”. Calculate whether you'd have paid more for the traffic gained if you had continued to sacrifice that 20% to Google as a fee for each additional click than you would have by paying the flat subscription cost to use Productcaster. We can help you assess this with our measurement framework.