Well I'm spoiled we used to have a Wilson audio here in Tucson Arizona and Bruce Wilson was incredible he would let you try audition any gear in your home free for 30 days
when you traded something in he gave you a fair price and he'll sold it for 10% more than he gave you !
I agree it's a real cheap shot when somebody gives you a low price or something you trade in or sell and then they turn around and sell it for high. Certainly makes you feel like you're being used or taking advantage of.
so you know it was not doing it to make a ton of money
he always offered bargain prices on New gear and had superlative service and advice
He sold new gear for about the price of a big box store so there was no reason to go there
That's really exceptional that he would let you take anything he had home and try it out for 30 days ( after listening to it in the store first and being convinced you probably did really like it)
He even dealt with fairly low end stuff he would take on trade so us poor college students could get great gear and he'd call me and let me know when he had something he thought I might like. And if money was tight he holds something for 30 days to let me get the money but with the 30-day trial I could take it home then.
He said he rarely got burned and really enjoyed doing business this way and he made plenty of money because he made a lot of money doing custom installs and running wires.

