Price ratios are just bull**** promulgated by people who want to sell you something.
I mean, yes, Swarovski optics are incredible. But on a high-end hunting rifle that might shoot 1/2 MOA, a scope that lets you shoot that comfortably and accurately without eyestrain is sufficient. 500 bucks, 1000 bucks, 2000 bucks, you pick. Just don't go really cheap.
As a shotgunner, I think more about geometry, weight, and balance than about how much it costs. And the picture through the scope has to be nice. That can be had for under $300. A lot of really expensive scopes are bigger, heavier, more complex. None of these things are positive qualities in a hunting scope. I'd look at these things first, THEN look at what you can get in various price ranges, and what you think of the scopes when you look through them.