You can not measure what you don’t track. We are not only talking about the R.O.I. (Return On Investment) from your marketing dollars but also how do you know when and how to make adjustments to your ad itself? Only by trial and error can you track, measure and keep improving your ad until it pulls the best possible results for you.
Does the headline grab attention? Does what you say in the advertising message prompt a response? Do you have a call to action that makes people want to respond to your ad?