I was paid a salary plus performance bonuses based on group objectives. When we were selling Nissan LEAFs like hot cakes, I was paid $50 per LEAF. When used cars was a push, I was paid $10 per used car. When fixed ops was a deal, I was paid $X when RO counts hit the target, and $Y when we hit profitability objectives.
There's a ton of ways to skin it. Best way is pay a salary that keeps the wolfs from the door, as marketing is a bit longer term play than most things in sales. Once the person isn't sweating the basics in life, pay them bonuses that motivate them to help the store achieve their goals, whatever they might be.
Total compensation will depends on their success, and what their talent is worth in your area.
