I think he means that you need to spend over $50,000 to get a quality sound from an overpriced speaker and that same quality sound was available for $25,000. Depends on how well your Wallet leather is stretched and then $25,000 does not become very expensive for a set of speakers.
The dealer was playing the stretch maneuver by only displaying the very expensive speakers. Actually in hopes that when you choose a lesser speaker you won't feel so awful about spending a lot of money.