I think it's just natural for people to compare house prices in their own areas.
Plus it's somewhat unique to London that you can pay lottery winner money to still end up living in a complete dump.
Also, it's one thing being from London or your whole family being there but I'm struggling to see why anyone would move to London for work reasons in 2023 when the costs are so disproportionate to the rewards (for most). I live in the SE and I'd have to triple or quadruple my salary to make it worthwhile. And imagine working your way up the career ladder to a decent 6 figure salary just to be able to afford the same lifestyle as a £30K earner living in Sunderland.