I have a friend who ties flies. Hard to believe how much he gets for them.
Last I heard, from him, some of them go for over $6.00 each.
AND he is constantly telling folks that he just doesn't have the time to make as many as some guys want.
A few years ago he had a shoulder operation, the doc told him he would have to do rotation exercises, he demonstrated how he ties flies, the doc said that that would be an excellent exercise, doing that for a couple hours a day would be fine.