Another obvious point is that you are not rich in complete isolation. You still need friends, events, celebrations, play-dates etc. Purely hypothetically, imagine someone earning 200K but they opt to only use 30K of that which is what many posters in the thread are implying is reasonable. They will have a life identical to that of a median salary. How would such a life look like when you're essentially "pretending" to have the same problems that people who actually earn 30K do? The quote above reflects the attitude of many people who clearly despise high-earners and would obviously not want to be friends with them. So how should "fake frugal" rich people live if they know that their friends and family are secretly resenting them for pretending to be poor?
I don't think anyone is advocating to only use 30k of a 200k salary and 'pretend' to have the same problems. I'm not. What I'm saying is don't earn 200k, spend it on improving your life with lovely houses and cars, fantastic holidays, good amounts saved and pensions that will enable you to retire early, private schools and help like nanny's and cleaners and then say, after paying for all that, that your 200k doesn't go that far because you've not got that much left after paying for those things and therefore have the same problems as someone who has the same left over from 30k without spending it on those things.
There's also a way that this type of spending is being framed as essential, and not optional rather than choice to spend more, or indeed at all, on those things. A holiday isn't essential, school fees aren't essential, they may be highly desirable and indeed, why not have them if it's important to you and you can afford to do so? But don't try and frame it as essential as a means to justify it, you don't need to justify it, if that's what you want to spend your money on then I'm pleased for you, it will enhance your life, but don't start pretending it's not a choice you're making.
Earn your £200k and spend it making your life comfortable, I'm actually genuinely pleased that you can do that, we need all types of jobs and earners to make it all work, but don't then tell me (someone on £19k a year) that you aren't really that well off because you've spent your money on making your life better and there's not a lot left, or that the things you've spent it on are essential and therefore it's not optional to spend that money, or that it doesn't go far.
There have been a few posters who've answered the question, without defensiveness and the answers have been interesting for someone who'll likely never have those choices, but the vast majority have jumped in with being defensive and trying to justify themselves and what they earn/spend.
And also this hang up about flippin' tax! Many on this thread will pay more tax per month than I earn.
I pay tax too, but the reason I pay less is that to lose 43% of my income would result in me living under a bridge somewhere, that's not the same concequences as losing 43% of 200k, that results in less luxury but still able to meet the truly essential expenses of life (and more over!)