i have and use many less expensive scopes! i,m not saying they are not good! but the chances of getting a bad one are greater, the less you pay! i have had bad luck with bsa scopes. i have had two out of four with shifting point of impact. thats 50%! bsa replaced them both for free, i have had several tasco scopes, that were just fine, but a few failed. and since the name of our game is hitting what we shoot at! every time we do our part, we expect our gear to keep up with our ability,s and im sure the scopes that cost more, are not replaced as often as the cheaper ones.
it also depends how demanding you are, i mean a benchrest scope is going to need to be very consistant compared to a plinking rifle! i shoot alot from a benchrest at 300 and 400 yards. and it separates the winners from the loosers! fast!
i think to an extent, you get what you pay for with scopes. i have used unertle, sightron, lupold, bsa tasco, simmons, and some no name scopes. and i have noticed diffrences in performance between the more and less costly.