What I'm hunting for depends a lot on the time of year, where I'm hunting, what I've already taken, and my financial status.
When bow hunting early in the season I'm only shooting a mature buck that I'd mount. A 4.5 year old with broken tines gets to walk. However, late in the season I might shoot him if I don't have any doe meat for the freezer yet.
Past few years I'd say I pass shots on 5 or 6 bucks in a season. Some of those 5-6 bucks I'll see multiple times in a season. I may pass on 2-3 different bucks twice in one outing.