desertratt, I don't think we really disagree. Sure, taking sayings literally and at face value can lead the wrong way, but we can surely apply the basic lessons they teach.
Many years ago I became a Private Pilot and learned how to do weight & balance calculations, later in life I started doing mechanics on oil field equipment that required aligning the rotating and connected bits or two very large and heavy pieces of equipment; the math formulas required in these disparate tasks is essentially the same.
One of the lessons I see in "Don't do it. It's a salable commodity." is "don't worry about what others think."