The glass is probably not the most painful tradeoff to hit that pricepoint. If you look at better quality scopes from the 60's to the 80's, they were able to get very good results with single lens coatings using what is now run of the mill glass. In real terms it is apparently much cheaper to mfg lenses now than then.
Where the pricepoint will bite you I think is the scope body, seals and poi shifts. Ex: I got a particularly cheap chinese scope on a rifle some time ago in part payment. My buddy was using it when the poi went screwy. The rubber "armor" coating kept us from noticing that the entire front half of the scope had separated. The view was usable, the scope was not.
Another example is a cheaper Simmons 3x9 of mine that has a decent view but has a poi shift as power is increased.
Same buddy as above had a cheap gift scope spit the adjustment screw out at the range.
I was present when another buddy had the rear eyepiece fall off a cheap scope at the range while he was trying to focus the scope.
I've had and seen quite a few more cheaper scopes where the seals have gone and the scope stays fogged unless you take the time to hotbox them to dry them out.
Any scope can fail but the probability of failure can get pretty high as price goes way down.
