a bit harsh I feel as every store has at least one qualified PGA. I've used 3 near me and been pretty happy with the service overall.
I'm very happy with my local AG store as well, I do my own research before going in, they price match for me, I order, I collect, I play...happy chappy
As for sales, people buy off people, always have done and always will. If you know your onions and can show some enthusiasm in what you are describing to the potential buyer and match his needs, the sale will take care of itself.
However, an excellent driver won't necessarily make a very good transport manager, and visa-versa. As such a low or plus handicap golfer won't make a good assistant Pro or even a good club Pro, he's essentially first and foremost, a good golfer!