I see your point. However, sales does not necessarily imply meaningless marketing copy. You act as a salesmen every day, any time you try to convince anyone of anything. A good salesman is not dishonest. He's honest, understands his customer, and guides the customer to a (mutually beneficial) solution to a problem.

Sales is not dishonesty, despite the stubborn misconception commonly held by engineers. In reality, sales is the process of convincing someone that Option X is in his best interest. There should be no trickery involved. If you're a good salesman, you can convince without dishonesty.