Except for that putting on a show is the key to success in almost every industry, whether you're an author, entrepreneur, salesperson, financial analyst, doctor, grocery store, etc. In fact the only area I can think of where this isn't the case is in amateur sports, which is telling.
On the other hand, I have very little understanding of how much time/effort is required by doctors and financial analysts, so I could easily be tricked by them.
Maybe not quite as universal as claimed by the OP but he definitely has a point.
I am willing to pay the sticker price for the groceries I pull off the shelf, not the cashier's skill in ringing them up.