Exactly. All the sights, scopes, pointers, and whatnot aren't going to make you any better if you don't use them.The best way to aim better is practice.
~Halfling
To add my lucky shot story to the pile...
I made it with a blowpipe. No scope or sight, semi-auto feed, or anything. Just a 30" chunk of 1/2 in. PVC and a micro dart. My friends and I were nerfing indoors, (Seattle in fall. Rain city) and my friend's little brother was hiding behind two folding metal chairs with a blanket draped over them. There was a little tiny notch in the blanket between two of them: It can't have been more than two inches wide and three tall. I was twenty-some feet away, and I could just barely see the top of his head through the gap. I made the hit. (Didn't win the game, though.

The only way I could have made that shot was by tremendous amounts of practice. I've been playing with that particular blowpipe for several years. If I had just started using it that morning, would I have been able to make that shot? Probably not.