Please let me respond to David99's query as to whether a $54k product is 54x better than a $1000 product. The Mona Lisa would probably never leave the Louvre, but would you prefer to see it hang on your wall or perhaps thousands of inkjet prints of its likeness? Or maybe a googolplex of them? Fine art may be priceless and perhaps a poor "value" but crap is crap!
Not a good analogy... There is only one Mona Lisa and there will only ever be one. However a $54k integrated amp, there will be as many made as buyers want. I'm sure Dan would happily ramp up and turn out millions of these bad boys if he could.
For $54k you could get some really impressive separates and buy some 1 of a kind art to put in front of them if they are not as pretty as the D'agostino amp. You could also probably hire one of the great amp designers to build you a one off that would rival this. I'm not sure what exotics are in there but they better be really really impressive to justify the price.
Of course if you feel it is justified, go ahead. We all buy products that sell for 100s of times more than they are really worth.