"You're old, and upside down! NYERRRRR!"

Newness in itself is not necessarily a bad thing, nor expensiveness (when warranted), nor simple shininess, whereas obvious shininess which is only there to advertise either newness or expensiveness is intrinsically untrustable. Well-loved and well-used things are slightly worn, and proudly so. Things which are shinily advertising newness and expensiveness may turn out to be trustable but wariness is certainly wise at first. What is the dazzle intended to distract the attention from?

The accumulation of personal shininess is particularly odd when it self-dazzles they who are accoutred shinily, or when the perceived expressed shininess becomes the dominant criterion in their accoutrement-selection-and-exhibition, especially when it's virtually explicitly stated as the dominant criterion (at the expense of any or all of functionality, practicality or usability). As if that were not odd enough, there could also be the accompanying behaviour of treating accomplishments as possessions in the sense of displaying them as a material achievement with a high shininess quotient.