What makes a DAC so expensive?


You can buy a Cambridge Audio AXA25 25 Watt 2-Channel Integrated Stereo Amplifier | 3.5mm Input, USB Input for $225, and most DACs seem more costly. 

I'm wondering what it is that makes a Bifrost 2 almost as expensive as an Aegir and 3x's as expensive as the Cambridge product, above. I would have thought an Aegir would out-expense a Bifrost by a factor of two or three. What are the parts that make the difference? 

I'm wondering if the isolated DAC concept is one that comes with a "luxury" tax affixed. Can anyone explain what I'm getting in a Bifrost 2, or other similar product that justifies the expense...?

Thank you.
listening99
I was going to get on and say exactly what Bill did.. @grannyring .  

Here's a link to the dac I suspect he was talking about. https://cdn11.bigcommerce.com/s-210bb/images/stencil/2048x2048/products/156/1340/Mystique_EVO_Inside...

Good luck getting those parts for $200.
And in my experience, when a designer uses high quality parts like these, that means they’ve got a product where they really care about the sound and have carefully manicured it’s performance. I bought my audio Mirror dac because of this reason and have not been disappointed. I’m totally satisfied, but would also love to hear the mojo dac above because the design decisions you can see from the internal shot are things I’ve found to really matter in my own component builds (independent power supplies, solid core silver wire, electrical isolation, quality choke-based smoothing, etc.).
I am lucky to own the best deal on quality/price for dac....Paid 24 dollars new, with a used value around a little more than 100 dollars...

No coming back..... My dac shows no limitations and in the beginning i had the impressions that my dac has limitations, for example lack of details...(Starting Point Systems NOS dac)

What an error i was making !

My audio system was not the culprit of my unsatisfaction at all, his triple embeddings was faulty simply...

Most people evaluate dac or gear on a wrongly embedded system and most of the defects they attribute to the gear most of the times comes from the electrical, mechanical and from the acoustical powerful embedding...

Thats life, who says that it will be simple?

The best quality of a dac consist in his total non-existence to the ears....This is my experience with S.P. S. dac. If you say no, it is retrieving details, i know immediately, especially if your system is rightfully embedded, that your dac is not a good one never mind the price.... :)
"As I've said before, the proliferation of costly high-end DACs is a clever marketing ploy to snare the gullible and unwary who conflate performance with price"
That's closer to the truth , the capitalism  comment comes in second
Capitalism, marketing,  playing on the notion if it costs more and looks prettier it must be better. Toss all that sciencey word salad in there and you have a 5 figure DAC. Very few if any could pick a $700 DAC from a $10000 DAC in a blind listening test.