They have learned to get around rules. The sales manager is too lazy to do it. The sales manager has a fear of not performing well in front of sales staff. Think about this. You just spent major time and money to find a salesperson.
Good ones are hard to come by.
Let him see the top brass in action. Well, no matter what I say, it will involve a shift in corporate culture. And some sales managers will claim they're doing some of what I'm suggesting. I' m outlining below. Most companies provide initial minimal training of the essential product knowledge and basic sales skills.