I think nowadays it's pretty much only Nintendo games that could get me to spend more than say about 50 quid. Maybe there's a few SpiderMan games I'd pay full price PS5 prices for and GTA6 is another exception I'd go higher on.
With Switch 2 I reckon I'd have been willing to pay more for Mario Kart had it of been more expensive. At £100 I'd definitely have bought it, at £150 even I still reckon I'd have gone for it - I know that I'm going to get an insane amount of value out of it even at those prices. The next Mario and Zelda games? Same thing, no issue at all paying £100 for them. The yearly re-release of whatever sports game? I'm probably never going to pay more than £20 for one of those ever again.