So, this assumption has several flaws that render the discussion useless. One is that the term "quality" corresponds in some way to "value" to its rider. The top professional frames have certain characteristics that are reflected in the performance of the frame when integrated to the top-level componentry and fitted to the rider's physique that can produce an impressive rider-bicycle system that performs at the very top tier of the sport. Top professional frames also have a consistent set of quality metrics that relate to precision of the dimensioning, finish, reliability/longevity for the intended use, etc.

Inexpensive frames also have a lesser expression of these very same characteristics, but at lower levels of expectation. Frankly, the riders who buy these bicycles likely have quite a bit lower ability to perceive the differences in any meaningful way. So, it all works out.

But the basic question is unanswerable unless you define your terms with greater precision.