If you actually think marketing before building is "common sense", then congrats—you've got more than most. But it's something most people don't learn without a

If you actually think marketing before building is "common sense", then congrats—you've got more than most. But it's something most people don't learn without a walk down the path of hard knocks. But more to the point; selling isn't marketing, you are correct. However, at a certain level these 2 activities are nigh-on inseparable and benefit from having a coordinated approach. Regardless of where you draw that line most business owners (especially SMB) suck at marketing AND selling.