I work in advertising. Beyond that, I have a basic grasp of the English language. I understand general sentence structure, syntax and diction. Word choice really is everything when you have a limited space or time frame to get everything across to an audience.
I typically work in thirty second increments when writing commercials. I have a mere half-minute to convey a specific message, the who-what-when-where-why aspects of the business at hand and a strong call to action. Thirty seconds is frighteningly minuscule if the information is assembled coherently and depressingly endless if the information is poorly written. Maybe there isn't a right or wrong way to write advertising, but there certainly is an effective way. A good way, if you will.