The last - almost - 4 decades now, i look through scopes for a living. Like most everything in life, "you get what you pay for". And, quality optics is certainly no exception to the rule.
The average workn' guy like us, can seldom drop $3K on a Swarovski, or Zeiss. Most of us are relegated to the $500 price range, and lately, those offerings have greatly improved in quality the last few years. And, with a little searching, many of those are often at sale prices around $200. But a cheap scope, like a junk trigger; just makes you want to stay on the porch!
For example, pick up a scope and look through it normally and notice around the circumference, are the edges fuzzy, or discolored like looking through a prism or kaleidoscope; are the crosshairs blurred out at the glass's edges??? If so, that's one indication of poorly manufactured glass.
Begin a study with a Google of chromatic, and spherical aberration.
Then Google the many professional articles on what makes a quality rifle scope.
But...still, that can't stop us from dreaming and planning for that high end scope!!! Buy the very best that you can afford - till it hurts, you'll never regret it!