Lack of hunting pressure.
Large tracts of land.
Intense deer management.
Many many hours/days in stand.
And of course $$$
I can sit in my best stand and see 4-6 bucks a day, but may only see a shooter 2-3 times a season.
This is where time in stand, pressure and management come into play.
I'm sure I would see more shooters if I spent every waking hour in stand.