"When I was in the sales side we tried to resolve some of this by
offering in home demo. With the condition that if the customer did not
like it he would not get a refund but credit."
Yikes, while I'm very empathetic in regards to the problems faced by audio dealers, I also couldn't imagine going for that solution, as a customer.
If I were curious about a $15K speaker, in your model just demoing it (at home) automatically commits me to having spent that 15K (if not on that speaker, another you sell).
No way I could commit lots of money just to get a demo of a speaker. I hear tons of speakers that seemed appealing during research, but which I didn't end up liking.
I've had a couple of in home demos and for the last one even offered to pay the dealer for his time. He said no problem, it's part of what he does as a dealer. (It turns out I intend to buy the speaker I demoed, from that dealer, btw).