Ok. I think I understand. Air flow around the fletching is what causes the rotation, so the more rotation, the more air flow (wind resistance) which is what causes the arrow to not only stabilize, but to slow down. Yes? This is the same reason feathers stabilize better than plastic, because of the wind resistance, which is why feathers lose speed down range as compared to plastic.
You make perfect sense here, and I see your point. But, to the average bowhunter who takes shots at 30 yards or closer, the speed will not have decreased by much, correct? Now, if you are a target shooter, who shoots at lets say 50 or 60 yards, I can see where the fall off in speed might make a problem.
So, if I understand correctly, more spin equals = more stabilization = better broadhead flight. But, it's not losing energy stored from the bow, I don't think. Yes, the arrow gets its energy from the bow, but the bow is not causing the spin, the air flow around the fletching is. So I could see that the wind resistance would slow the arrow down, but not that the spin is eating up energy it got from the bow. I don't know, maybe it's basically the same thing. Not arguing or trying to be disrespectful in any way, just really interested in this topic.
Or am I completely off base here, which is most certainly possible.