Sure, games on pc are cheaper.... but I've not paid 70$ for 95% of my games this gen on ps5 too.If you're a multi-console buyer, there's little to no point in buying consoles.
£550 xbox + £500 PS5 = £1050 for hardware
£70 games at 5 a year = £350 a year
£10 (gamepass) + £10 (PSN)/month = £240 a year
If a gen lasts 5 years you're looking at £1750 in games and £1200 in subs, plus your hardware of £1050 = £4000.
Buy a £2000 PC rig, get games much cheaper, or free if you're sailing the seven seas, mods, better game support from the community, emulation and now console games. Plus it's a PC with all the extra multi-media bits that come with it.
5 years is a long time for pc. You will upgrade it in this time. more than few times.
I would say, realistically you save 10-15$ on a new game getting it on pc vs ps5 physical.