The standard practice is you buy it for full price and have a 30 day period to return it. I think the dealer is taking risk by letting it out of his store and 5% (that will be applied if you buy it) is fair.
Fee for home audition
I am in the market for a music server/streamer. I was discussing with one of the authorized dealers for a streamer. He had a demo unit and was willing to bring to my home for an hour and let me try. He is located around 10-15 minutes from my home. He wants to charge 5% for home demo. Is this the industry standard? I am not meaning to disparage anyone so not going to name the dealer. I am just trying to see what the standard practice is.