Why Must You Pay Sales People Commissions?
Why do sales people get commissions and engineers don't? Because the sales person knows exactly how much money they bring in and can claim "if I didn't make the sale, that money would not be coming in" even though it's not always true it's a good story. An engineers actions are so far removed from revenue that they can't make a claim so directly. Also, if they did want to claim a portion of product revenue they could just as easily be fired and the revenue would still flow. Such is the delay between engineering work and revenue.