You're absolutely right, but the fact is the Levis that are being made in Turkey and India today aren't the same as the Levis from the 70s. Anything mass-produced is going to have corners cut, whether that's in quality of the fabric or what they use for the stitching, how much hardware they're putting in, which areas have they decided to reinforce or not, blah blah. Over the last 20 years there are a lot of smaller denim makers who are doing things that make a better quality garment, run by repro dorks who care about things like stitching tensions and rivet placements. Things like raw denim or selvedge ids are fashion pro forma now, but they started as signifiers of a considered production - "this fabric is a tighter weave, we've cut and sewn the pattern with care" - that generally means those jeans will look better and last longer. It also means that they can be more expensive. My point was more that you can easily get jeans from the Gap for $150, and it's not going to be the same as spending $150 for a pair from Naked and Famous

End of the day they're still just cloth tubes that cover your legs, and all jeans wear out eventually. Which is why the more important advice is to hand-wash them, and learn to repair/ patch them as much as possible over their lifetime