DAC diminishing returns

Looking for some experienced input on the diminishing return as you go up the the DAC ladder. I mostly stream music and occasionally listen to CDs.  Currently, I’m using a Schiit Bifrost Multibit DAC.  It’s connected to my Naim Nait 5Si and that drives Zu Omen ii speakers. In my limited experience, I have not heard any substantial differences when changing DACs.  I’m considering a Denafrips Pontus DAC.  Does the significantly higher cost justify what might be a marginal increase in sound quality?  Is buying a more expensive DAC for better sound just splitting hairs, and making you feel better about your system?  Are different DACs just different coloration of the sound?

I don’t want to be duped into buying something I don’t really need. Thanks.