@amirm I agree that the main point you make, which is absolutely correct, is that companies want to get their foot in the door and are counting on you not to return it. I suspect this is often the case.
Anyone who has run an Amazon Reseller business (we did) will know that returns are always low, as long as products are reliable. It's not related to shipping inconvenience, which for Amazon is straightforward. Anyway, my experience in the UK is of free door-to-door shipping and my dealers will usually bring items to me, sometimes I pick them up, without payment.
You can form an opinion something is useless, but if you don't try it you won't know. I saw today on PS Audio that some guy, a strong believer in measurements first, bought a P3 regenerator recently, with the return option, loved it and still does. He was arguing he wanted more measurements to prove it worked, obviously forgetting his incredibly glowing review a few months before.
I try and keep an open mind on everything. If we knew all there was to know about engineering we could close all the research labs. Who would bet against our knowledge of acoustic and audio engineering not increasing over the next 10 years?