Assuming even average smarts, they all wouldn't be doing it if it wasn't worth it to them for whatever reason.
It's just another one of those things to add in the statement; "Yeah, I caught that fish on a fly I tied attached to leader that I furled being cast by the rod I built with the guides I twisted and the reel seat and grip I glued up and turned on my lathe. Naw, ain't hard to do at all. Just eats up a little time is all."

As my brother says; "Ain't nothing but something to do."

Joe