I run a small puzzle app called Dayzle. I’m a numbers guy, so a marketing optimization problem is right up my alley. Two weeks ago I turned on a Google Ads campaign for Android at CA$40 a day, with the goal set to installs. For the first few days it barely spent anything. I had a target cost per install of $1.50, and Google couldn’t find installs at that price. So, as a test, I removed the target. It immediately spent double my daily budget, CA$80, and reported 21 installs. I was excited. Then I...