I dunno, PS5 sales are enormous, Sony have increased the price because they can. MS released the Series S as a budget option and it was a total failure. That said the price of this Pro model is nuts, it could maybe be justified if it had a disc drive and the stand included but releasing a product that is lesser in some areas at a 30% markup is just bananas.
My guess is unlike the PS4 Pro Sony probably feel the PS5 Pro is just a "Pro" option for more hardcore gamers and are happy that the PS5 will still be the defacto for most? Whereas the PS4 already felt like it was struggling with games by the time the Pro came out.
Who knows, Sony gonna Sony, they always make baffling decisions.