One definition of 'overpricing' is that in the revenue (quantity x price) drops.
This is the case in an 'efficient' market with full 'price elasticity' (the cheaper you make it the more you sell) with full working supply and demand balance.
None of these 'laws' apply to the nutty 'high end audio' market. It may actually be the opposite. In this case: they may sell MORE at $133k than at $20k (the full manufacturing cost (including overhead, development, material, labor, etc may be $5k for such a speaker) since 'nutty price' is actually a sales attribute that buyers crave and desire in the realm where a negative cost/benefit ratio starts.