I'm not an agency, I'm a user (lol). Just compared 2019 and 2018. Possibly apples to oranges, 2018 was a regular campaign and 2019 was a smart campaign (and google set it up on a complete different account so now that data isn't in my regular account. grr. ) Anyway, questions, both types of accounts performed quite similarly , it appears for 31¢ to 32¢ I get my leads from Google. In 2019 I spent $500 more dollars than 2018, got approximately 1000 more clicks (smart campaign), and added about 26K more in gross. Impressions for both years was 002¢ or 004¢. These numbers, also figured out that based on my gross and my visitors, in 2018 I made $1. 31 per session and in 2019 $2. 00 per session (don't know if any of that matters). but the question is, is it reasonable to just follow the math to say if I want to gross, 2 or 3 times as much , ad spend should be x based on increases? I do this for all things thinking it is at least one way to forecast but . just curious if it makes sense.