This kind of response is one I have heard multiple times from people who have tried tackling the world of Google advertising, especially in the nonprofit world. Though Google wouldn't be where it is today if this was true. I also know that many of the nonprofits I have worked with would not have seen the growth they have over the years if you removed Google Ads from the equation.
Numbers are a fascinating thing to me. They are so absolute yet just like words can take on all sorts of meaning depending on where you get them and how you present them. In communications numbers are a vital part of receiving feedback to what you do. Especially when dealing with the online landscape. They tell you if people like, read, share, and ultimately respond to your message. They can inform you if you are wasting your time or maybe even doing an awesome job.