Audiophiles are people who are willing to pay absurd prices to "high end" audio equipment (like speaker cables for $10k and more) which they claim to be clearly

Audiophiles are people who are willing to pay absurd prices to "high end" audio equipment (like speaker cables for $10k and more) which they claim to be clearly superior in sound quality, while the technical explanations fo the equipment's superiority are often nonsensical and the sound quality is not in fact distinguishable in blind tests. The grandparents is implying that the price of Stradivarius violins is also based on assumed rather than proven quality.