I'm pretty sure a professional would rather buy a dual-socket Xeon based machine (say 2x E5-1650 v4) that has 4x the memory performance for closer to half the price.
A lot of professional photographers don't know much about computers and CPUs. Remember that "professional photographer" crosses a very broad spectrum of photographers, since the bar is basically "I charge for my work".
For better or worse, many professional photographers often rely on the advice of friends and salespeople for "something fast enough for what I need to do".
For better or worse, many professional photographers often rely on the advice of friends and salespeople for "something fast enough for what I need to do".