Dunno if it's the stylus or the extra horsepower in the pro (or something else) but the iPad Pro runs the full version of the clinical software used in my wife's office, with all the features of the desktop/laptop version (without lugging a fugly "convertible" tablet). The plain old iPad (iPad amateur?) only runs the pared-down version that smartphones get.

Not to say there aren't plenty of well-heeled poseurs that get the "Pro" for the name, but some professional users do need the extra features and power, and the price premium is easily justified by even a small productivity boost over a tablet's working life.