I don't want to take away from a couple of broadhead threads that are already ongoing, but I wanted to share some wisdom from one of the most successful bowhunters that I've ever met. Gerald (Gabe) Shaffner killed a bunch of big deer in east central Illinois. I believe that he had over 40 deer that scored over 140".
I asked Gabe what he felt was the number one thing that made him successful. I figured that he would answer, scouting, time on stand, playing the wind...you know, all the standard answers. He said that the one thing that was the most important was shooting sharp broadheads. For years he shot nothing but Bear "greenies". He would use the same arrow for a morning and evening hunt and then go to the next arrow in the quiver for the next day. He said that once an broadhead had slid in and out of the quiver a couple of times, it wasn't sharp enough to hunt with until it was touched up again.
Some may think that this is overkill, but for no more effort that it takes to touch up a head or pull a different arrow from the quiver it seems like a good idea to me!