I don’t want to be duped into buying something I don’t really need.
This is a fascinating statement, in that the OP implies that if it improves the sound then it is a matter of "need." It's amazing how us audio freaks have extended Need from food and shelter to fidelity upgrades. Our poor spouses.
Anyway, DACs do sound somewhat different - not as different as speakers but there are still differences. I like to switch back and forth from my Schiit Gumby and my Mytek Liberty II. Very different approaches.