I feel the above statement is far from true. There are no miracles in high-end audio. If something sells for 50% off, well, it might be because that's what it's worth. The manufacturer might decide on a selling price, but it's eventually the market that has the ultimate say.
Have you ever seen Spectral at 50 off? How about Audio Research or any of the others mentionned so far?
In full disclosure I had faulty Moon products on two occasions from the house of Jean Poulin. Neither the dealer or manufacturer would give me the time of day following my troubles.
Don't get me wrong, they make good products and above all, compensate ordinary sound with exceptional good-looking metal work. But in my book they are not worth the money. You can do a lot better for the price. But if you can get it at 50 off, it is of course worth considering, but not an automatic recommendation. But in the same league as Audio Research? Forget it.