I've had 2 fail in the past, a cheap 3-9 Tasco and an expensive Leupold. So cost doesn't seem to be a factor. But then ,, most of my guns/scopes have shot more ammo off than most people have ever even seen before, so that could be it too.
Back when I was competing 2-3K rounds a week wasn't unheard of at all, and pretty much the norm so they got lots and lots of use. I only have 2-3 etched ones so far and I like them, the scopes seem to be brighter sense there's no "ring" to hold the cross hairs in place and the x hairs are finer and sharper it seems. I don't know if that holds true for all but mine do seem to be a bit better.
I should do a side by side someday just for shits and giggles.