It's not that they care a ton about price (they do, but), but that price is verifiable, certain, and stable,, while future benefits are not, or might be rugpulled.

I have lots of problems w/crypto, but one thing they've gotten right is the credibility of self-binding. Without that, it's just hard to trust any actor on their future behavior---from Reagan's immigration amnesty, to cable tv's ads, to funding government agencies that ("this time") will fix a problem.

(None of this is motivated by any dislike for USPS, which I generally like. I'm just talking about people's (imo justified) reluctance to trade the known for the unknown).