My few dealings with TMR have been more than honorable. They took back a REL sub that hummed and crackled and gave me a good discount on the next model up. Other purchases just worked fine.
Best Buy doesn't need to let you return speakers or loan them out for trials. But a high end audio store isn't that. It's simply a part of the game if done right. If there is a lot of work in setting up the demo in the home, then I think it would be OK to charge for that (credit against the purchase price), but having no ability to try $48K speakers in the home isn't the way this business is done right!