I use to tie just two. Bluntly the tie wasn't as good as it should be tying only two and most of the time was spent just dragging out the material and then putting it away. If I tie anything new these days I tie at least 4 and 6 is better. If I don't think that I will use 6 of that pattern, I choose something else to tie. It helps me make a decision if the pattern is really what I want to tie. I like to give away flies to those who like to give me flies or new people that I know don't tie. When I tied just two of a pattern, I find that my box has a whole bunch of one of a kind flies. I didn't want to loose the last one that I had and I was afraid that it might be the hot fly of the day and I would loose it after a fish or two and not have another one. A One of fly in my fly box is a lonely fellow indeed.

Rick