I once overheard a conversation while I was giving a fly tying demo for the Roaring Fork Valley Fly Fishers that I "tie flies to catch fisherman". I had to retort, no sir, I tie flies to catch fish first and foremost and then I like to sell them so others can catch fish too. I will only sell or demonstrate flies that I have proven to be worthy of permanent residence in my fly box. If and only AFTER a fly pattern has reliably caught fish do I dare mention of its incarnation. Before then, a fly goes through my own testing. Frankly, most flies are retired and donated to charity if two seasons of testing prove to fall short of my expectations.