The kind of frugal that the OP is describing doesn’t sound like actual frugality to me -;it’s being frugal in order to get something else as well.
If I analyse myself and my spending.
My salary pays all my bills and I have an automatic direct debit into my savings account each month. I live alone and don’t have a credit card, I live off what I have.
I certainly can’t afford everything I want in life though, I have to make choices like everyone does.
Life can be cut short with no warning and there’s things in life I want to do and places I want to see. So this is what I aim for and in order to do that I have to be frugal In other places.
So I shop at Aldi mostly, and I search eBay high and low for clothes brands I love on the cheap. I’m much better now at FB market and have sourced remaining household items I need from there and so forth. I’ve made good money selling my unwanted items. I go running instead of the gym, I meal plan carefully to avoid overspending. I stock up on things when they go on offer.
So to many, I look like a nice and sensible frugal person looking after their money.
Except it’s so that I can afford to go on holiday and do things I want to do. The money I save from the above means I can travel to see my friend who lives further away, I can afford some day trip and I can save to go on holiday each year. Any money left in my current account the day before pay day is transferred to my savings, so I aim for this to be as much as possible.
So I’m not really frugal in the right sense and I don’t think many are. It’s a means to an end for many. Owning a horse and going skiing and on safaris is not frugal, it’s just a choice of where to spend money.
I don’t ski or safari or have any animals. My holidays are certainly not 5 star. But it’s what I like to do and to do that I have to save somewhere. I could buy all my clothes brand new from the shops I love and shop in M&S food and have the best Sky package etc but then I wouldn’t be able to travel or see friends anywhere near as much.
Middle class and upper middle class that OP describe aren’t so much being frugal as they are just making choices to enable the, to have everything they want in life.
Actual true frugal living is not having enough to live in 5he first place and making it stretch to cover what you need. I admire it and copy many ideas but ultimately it’s so I can put some money away, not for survival sake. Not anymore anyway. The last year is the first time in my life I’m bringing home more than £18k in income and I can definitely breathe better now.
So no I don’t think the upper middle appreciate money more necessarily. I might now count as middle as a newly qualified teacher and I certainly appreciate every penny I have!