And as a follow-on comment rather than an edit...
There's nothing smarmy or dishonest about sales. Misleading sales is bad sales. The best salespeople are focused on fulfilling the customer's needs, not selling the product. The product sells itself once the customer understands that it fulfills their needs and offers them real benefits relative to the expense. And expense isn't just money. It's time. It's risk. It's learning curves.
Customers often don't understand their own needs very well, so a big part of sales is helping the customer understand their own problems, in order to provide valuable solutions.
The engineer who can really dig into requirements, really get to understand the customer and help the customer understand their own needs, and then offers a working solution, with clearly stated benefits and clearly stated costs, will do far better.