…is writing adcopy off the top of their head when they come to the ad creation screen in their traffic source. In other words, totally wingin’ it!
Adcopy is the most part of your campaign and should be your #1 priority in getting right. If you just make something up with no real thought behind it, chances are you won’t produce something powerful and compelling enough that will actually perform. Once you have a good control ad you can start testing more spur-of-the-moment ideas.
I suggest getting organized and writing as much copy as you can before you even launch a campaign. It will make split testing easier (and more fun) since you know what you are going to test next and will keep you from spinning your tires!