Yes, please list what $300 dollar DAC's sound better than $2K DAC's. Please list them as I want to be enlightened. Below is a list of the DAC's that I own, have owned, reviewed and heard at friends.
The Cheap DAC's that I have heard are the Schiit Modi 3 which I own, 3 of the Dragon fly DAC's, 2 of the IfI DAC's, the Topping E50 which I own. The expensive dacs that I own, have owned, reviewed and heard are the Luxman DA-06 (my personal DAC), Marantz NA 11s something which had the best tone and decay with the Piano that I have ever heard. Wish I still owned that one, Van Alstine Ultra a hybrid tube DAC that I still own, Cary Audio 200TS, Chord Qutest which my son owns, Cary SI 300.2 D integrated with a built in DAC. These were all my personal DAC's. DAC's that I have reviewed or tried in my system some others we did a DAC shoot out with are the Bryston BDA1 and a newer version, Chord Hugo, Bel Canto, Auralic Vega, Exophone 22 (not sure the spelling on this one) PSA Direct Stream which I should have bought over my Luxman, Holo May, T+A DSD8, a higher end Lampizator, W4S dsd se with Femto Clock upgrade, The Exogal Comet with the upgraded power supply that I wrote a review for the company, Aqua La Scala (my personal favorite) and Formula.
Keep in mind, it is all about system matching and cables. My DAC sounds remarkably different with different usb cables. The best with my DAC is the Wire World Starlight Platinum which took my DAC to another level of refinement.
By the way, we did a DAC shootout with a guy from IFI present and he brought a tube dac along and it was the worst sounding of the bunch. It was also the cheapest at $500.
It helps to have higher end resolving gear.
Now I don't doubt your experience and what you heard but please give us a list of the gear you are talking about. Also list your other electronics and speakers. I use Magnepan 1.6's with dual subs. I am looking for a good inexpensive DAC that sounds better than the Topping E50 and Schiit Modi that I own.