A pretty absurd thing to say (probably by someone who has an overly inflated opinion of themselves) and also a contradictory statement. You can't get the experience unless you make, and sell, the holsters, but if you don't sell them then how are you going to be able to keep making them to get that experience? No-one can make "hundreds" of holsters before deciding to sell them.
I'm with you, LiftPig. Once you understand the basics of holster making, whether pancake-style or western, it's not that difficult to make them properly.