Never Tell the Sales Staff Your Lowest Possible Price If You Want to Get More!! ─ Law #45
The sales staff wants to win and, with a bit of natural impatience, giving them the lowest threshold price is handing them a torch burning at both ends.
If a sales person becomes too knowledgeable about the financial factors in running a business, it will weaken their ability to sell. Be wary of the sales person who uses terms like ROI and gross margin in his vocabulary.