Quality and luxury are different concepts. Quality is functional and luxury merely describes relative price. People expect a luxury good to be of quality, but there are many examples to the contrary that obviate this generalization, e.g., an expensive high performance car that breaks a lot such as recent Mercedes versus a less expensive Toyota that's rock solid reliable. The quality of some luxury goods such as perfume, liquor, and designer clothing can't even be defined because the rationale for their purchase is completely subjective - how it smells, tastes, or looks.