Ofc it costs, and not lil, remember its not as simple as a pc port, when players can bruteforce that shit with higher specs, by the time game is out(if no delays, u never know nowadays

) it will be 4 years into ps5 lifecycle and we gonna have ps5pr0 launched too.
Switch is much weaker from ps4( roughly 4-5x weaker if we compare docked performance) but at least its not legacy console yet, and has bigger playerbase, ps4 playerbase by holidays 2024 will mostly move onto ps5, as it should be.
U can search for sales depending on platform, on GAF here we got quite a few threads with solid info, mostly from UK but not only that, games on ps4 barely sell nowadays vs ps5 or switch.