The basic truth is, the more efficient your system is, the less it matters what kind of business you are running, because you will be maximizing your profits at every turn in any case.
It is entirely irrelevant whether you are selling the latest ‘super duper gizmo-style widget’ or a product that has been around for years, with an efficient sales system in place, you are naturally able to squeeze every last drop of profit out of whatever it is you do.
It should be obvious that this is extremely important, but you may never have considered exactly why it is so important. You are about to find out.