I believe that any photographer who maintains secrets and is unwilling to discuss technique probably does so for a reason; i.e., scratch the surface a little and what you will find is some gimmick that this alleged artist has pounded into the dirt as a substitute for any real accomplishment. The photographers that I've learned from have all been very emphatic in their assertions that they have no secrets. It shows in their work, which is fine in a self-assured way, and never in the least bit affectatious.