Different country but our combined income WELL exceeds £100k. Can absolutely confirm that if we had to go down the route of expensive new cars (plural. Even singular will be a push), a holiday home (like, LOL), multiple foreign holidays (maybe 1-2 a year max), and whatever else people think, we'll be left with very little every month.
Now, I will admit that with careful mathematics, 'some' of the above could be in reach, but we'll be left exposed during a major downturn. We prioritize differently.
So despite our income, we still dutifully queue up for economy class, shop the weekly specials, look for cheap hotel deals and getaways and budget our holidays. Perhaps it's different when you're getting to £300k a year, but I wouldn't know