If you’ve used 20 plus of any optic and none of them have last more than a couple hundred rounds for you- either you’re mounting them to a horse drawn cannon or you can’t properly mount and maintain a scope. I don’t care if it’s a Vortex Crossfire.
As for my personal use of a Mark 5, I’ve used maybe one that fits the description you’re looking for. It was mounted on a friend’s Bergara HMR that he is financially able to use as a truck gun. It still runs great.
I personally have two VX5s that have seen some heavy punishment. One is on an 18” AR I built that is my main varminting rifle. Rides around in the truck uncased. It’s seen the dust, rocks, dirt, and plants of the SW NM desert many times and has 500 rounds or so on it. Runs fine.
My second VX5 sits on a Proof Research Elevation 6.5 CM. Only 200 rounds on it or so. It’s been bushwhacked with on three hunts now. One fall sticks out in my mind where I had my rifle in my left hand going down a slope. My feet slid out, sending my rifle into the dirt and a few rocks. All my weight landed on my left hand which was just forward of the action. So the side focus turret, elevation turret and left side of the gun took the brunt of it. Scratched and marred my action, barrel, and scope a bit. Shot 1000 yards with it later that afternoon in a quick zero check. It’s perfectly fine.
So I guess it’s going to upset you even more when I say I believe in all of Leupold’s products, so long as we’re comparing them to what you should expect at that price point.