Price is dictated by many factors like where it's made, what materials are used, level of QC just to name a few. Athlon sources their manufacturing from China and Japan. My guess is their mounts are one of the Chinese made items. Chinese made goods have issues that require extra vigilance in QC because the Chinese are known to cut corners at every opportunity possible. A lot of us also do not want to support their economy.Unless it's an eratac I can't see value inthe price of the vast majority of unimounts. I have used several of the Athlon 30 & 34mm by 20MOA (would like 30 as an option) on different rifles and they are perfect. They are between a third and half the price of many options. I'd suggest any of the level bubble stuff is rubbish anyway unless you can clearly see it fully engaged in the shooting position on the rifle, assuming they are even accurate.
I don't understand people wanting "chunky" mounts for strength, less machining or not casting smooth radii just result in stress raisers and opportunities to catch or drag on things.
Bubbles for the most part are accurate. It's all the many other factors with the shooter and system combined that mitigate the usefulness of levels.
As far as chunky or thicker mounts go, the objective lens and turrets poking out of the top and sides of the tube have a much greater chance of catching and bumping into things than the mount does. The extra weight of a thicker mount is negligeable.