Their pricing starts at $500K (but realistically will be $1-2M per order at a minimum). This is not intended for people who browse their website, click "buy" and fill in their credit card info. If you don't want to talk to a sales rep you were never their target customer, and I'm sure they aren't sweating the hypothetical lost sale.
Making it harder to compete with them is a good thing for Oxide, obviously, and therefore why it provides negative incentive for them to publicly advertise pricing.
I wonder how much the premium is over traditional server hardware with the same capabilities. You save some integration work and need less know-how, but it’d be interesting to compare.