Charging A Fee To Demo An Amplifier In A Brick & Mortar Store

I Saw a pair of pre-owned tube monoblocs for sale on an onlline forum for around $17k.
The seller has a retail store for hiigh end audio. The seller mentioned that there will be an up-front fee for the demo if a prospect comes to the store the amps are not purchased. The demo fee may also be used for credit towards any purchase in the store.

This is the first time I’ve ever heard of this. Is this now a common occurance in high end audio stores? I sent a note to the seller asking what the demo fee amount was....two weeks and I didn’t get a response.

Does anyone know what amount of fees are charged for a demo?
Charging someone to demo gear that they are selling is insane! The seller should accommodate you in every way possible, including sharing his or her expertise. There are many times when certain components do not pair well. On a different note the seller should ascertain the seriousness of the buyer if it is a private demo. I do private demos but I also ask questions about the gear the person has. If the person  has a Marantz receiver and wants to demo some MTRX/2 I would have reservations.
Sep-16-2020What is the inconvenience fee associated with an in-store demo...fully face masked, of course?

These are packed and put away. Can you tell me what kind of system would you want it demonstrated with ? Please call the store...Probably $500.00 which will be applied to purchase price of $16995.00

When you purchase products at retail prices, they are set up for you in the store ready for audition and also in home delivery and setup.
When we are selling DEMOS on products that retail at $60,000.00 USD for $16,995.00 then we have to charge a fee.
We have to do this as too many customers want to expand their hobby with no real desire or inclination to purchase. They burn 3-4 hours of time and make insulting offers. Just like you, our time is worth something. Charging a fee allows us to determine if you are serious. If you dont like the item, you can use the said fee to purchase something on the spot.
@mitch4t is talking about norms and best practices, here, not about "rights." FWIW.