Zero boards are saving them. I have literally zeroed a Vortex scope at my house on a gun that would shoot 20 shots into a half inch, put it in the car, driven 4 hours to the match and had to move the zero 2 clicks after checking zero on the zero board. Now, on matches with no zero board, it will make a difference. Also, one shot over the course of an entire season will lose you a golden bullet. Yeah, any equipment issue can cause you to lose and a scope that shifts zero is on the list. The list of stuff that can cause your zero to move is quite long. However, when you can consistently shrink a small group by 50% or more just by swapping the scope and you can remove the problem of a shifting zero just by swapping the scope, it would seem the scope is the issue.and yet Leupold, Kahles, and Vortex are on every podium.
Why are mid-pack and below shooters unable to be competitive because their scopes don't hold zero, but the top shooters are winning with scopes that don't hold zero?
If a scope breaks that's one thing. But a scope that tracks fairly consistently (not even accurately) and zero moves a tenth up and two tenths right over the course of a match isn't costing anyone a Golden Bullet.
Also, most people in the comp world have been checking tracking for years. Most scopes track accurately now and even more (nearly all) track consistently. Also, losing zero is on a spectrum. Some scopes hold zero unless dropped or really bounced around, some won't even hold zero under normal use, some won't hold for a car ride, and some, like a typical NF or Trijicon, will hold zero through some abuse. That's to say nothing for barrel to action fitment, bedding, base, rings, action screws, etc that can also cause problems.