Do you know which DAC IC they use? There are no info about the DAC on their website other than:
"High-end DAC technology"
Native Sampling Rates
32 - 192 kHz
Bit Depths
16 - 24
Performance
SNR - 110dBA
Distortion, THD+N - 0.005%
DAC
32-Bit, 192kHz
If you look at the specs, such as THD+N - 0.005%, that's not "high-end DA" territory at all, even something like a Denon AVR-X3600H (that uses DAC ICs with average specs, hardly "high end") can do THD+N- 0.001% and SNR - 110.5 dB and that's measured, not just spec!!
That being said, even though the Node 2i is not considered CD quality capable based on bench measurements, you have to ask yourself whether 0.005 or even 0.5% THD+N is audible to you? I bet most people can't, and all manufacturers likely know that so they have no fear, and know there is no need, may be even no point to spend money on a DAC chip that won't make a difference to most people.
So I believe the high prices(relatively) are mostly made possible due to their success in marketing. Bluesound, MQA, Bose, Audioquest's Dragon fly DACs, all are excellent in marketing, and they managed to make a lot of people believe their claims to the point they would actually "hear" the claimed benefits (with their eyes and brains
). They will never know the truth unless they somehow have the opportunity to participate in controlled DBT comparisons that would most likely never happen.