Here is a link that might help you. I have not read all of the content so I do not know how detailed the information is about the importance of removing burrs from the cutting edge.

Burrs on any cutting edge imparts a " jagged" cut. Jagged cuts tend to cause blood to coagulate in the wound and will slow or stop the bleeding faster. Additionally, a burred edge will dull quickly.

Although a broadhead and shaft cause a large open wound, any edge in your favor is advantageous.

http://www.bowyersedge.com/broadhead.html

Good luck!