For me it comes down to this.

I do not want to give my position away. Even though i have buck in front me, you never know whats coming.
I have done it. In 2005 I did it on a rut crazed 10 I shot. He was so crazed he had no idea. He went by me 4 times that day before I decided to chance it.

It has cost me also, in 2003 and 2004 I had a 150 class 8 within 15 yds with bow back. Deer did not stop, I did not bleat nor did I shoot. I have decided to take it one encounter at a time.