I'd say that those high quality things that still exist do so despite of the higher volume of junk and they mostly exist because of other reasons/unique circumstances. (Individual pride, craftsmanship, people doing things as a hobby/without financial constraints etc)

In a landscape where the market is mostly filled with junk by spending anything on "quality" any commercial product is essentially losing money.

>people doing things as a hobby/without financial constraints

Isn't this the exact point I was making...? I get you're arguing it's only a single factor, but I feel like the point still stands. More hobbyists, less financial constraints