So I think I've come up with a decent short list of what has been uniformly junk in my rather extensive testing as well as a way to calculate how much you need to save up to get into any particular class of optic.
First junk optics: BSA, Primary Arms low end (their really high end stuff is actually pretty good), Barska, NC Star, Centerpoint, Counterpoint, Nikko Sterling, anything else under about 200 bucks for a fixed power and under about 300 bucks for a variable.
That's for what I'll call "standard glass" which is what most people are used to and which I find incredibly hard to deal with as a match shooter or as a hunter. These are not hard and fast numbers but generalized budget numbers based on a sampling of what's available and what's popular enough to show up where I show up. So, think of it as a price guide, not a calculator or catalog.
A decent base optic should land you as discussed earlier at 200 bucks for a fixed and 300 bucks for a variable.
Illumination should add ~100 bucks.
Target turrets should add ~100 bucks.
If you want to add really really good target turrets then add ~200 bucks.
If you want to best possible quality target turrets add ~300 bucks
Side adjustable parallax should add ~100 bucks.
If you want a really cool reticle add ~100 bucks.
If you want locking turrets add ~50 bucks.
So if you want a decent variable with illumination, target turrets and adjustable parallax then you should plan on spending at least $600-700.
If you want to add slightly better glass to the package then add $300.
If you want top end glass $1000.
Let's see how that works out.
An SWFA SS fixed is ~$300 bucks, 400 bucks with side parallax.
An SWFA SS 3-15x is ~$700 bucks. Take the base variable and add really good target turrets and side parallax (300+200+100 = $600).
A Burris XTRII is ~$1100-1200. Take the base variable and add really good turrets, illumination, really cool reticle, side parallax and slightly better glass (300+200+100+100+100+300 = $1100).
A Vortex Razor II is ~$2200. Take the Burris XTR II and upgrade the turrets (+100), upgrade the glass (+$700) and add locking turrets. 1100+100+1000+50 = $2250.
Seems like it holds up pretty well if not exactly. So now you can tell if you go for a scope what it should cost and the compare that to what it does. If it comes in substantially under what the formula calculates then you can assume that quality is compromised. If it comes in above that feature you can assume that profit margin is optimized.