Some like tinkering and some don't. I don't. For one thing, I am not handy with it, and secondly, I don't see a real need for most of it. Like Bisch, when I find a good combo, I stay with it.
Mostly, I hunt Georgia white tails. I found out a long time ago, that essentially any arrow that tunes well off any of my hunting bows is heavy enough and penetrative enough to cleanly take a deer. Granted, if I ever go after considerably bigger game, I may need to re-think this a little.
I do feel that many newer guys in particular fixate on "stuff" that just ain't that big a deal, when what they need more is to practice a lot with concentration on form. After the form is solidified, then let the fine tune tinkering take place. However, its hard to criticize those guys who like to fool around with their gear, and often I do find some of their findings to be quite enlightening. Its all good, and its all fun.