There's tons of lego-knockoffs and of not even such lesser quality that the difference can be perceived by casual inspection. The set-to-set quality bar is really where it is, especially among their set lines not targeted at children or low-end of market.
But none of those sets have any kind of staying power. There's Expert/Creator/Modular sets from 20 years ago that sell for $500-1000 _opened and pre-built/re-disassembled_. That's all brand power.
So they're less about $/brick (though i know people scrutinize it) and more about price point and brand. Phrased differently, having your brick company race to the bottom sounds like a losing strategy.