Because if we are really rich, of course it adjusts and for socialites like that they don't really care about prices, even some of the shops they go to sometimes don't include prices for the goods they buy or the food they order. but for people in the lower middle class the concept is not like that and things like that are only used as an idiom that when we buy the baramg we want to not really look at the price that is meant in that case just not to think about it and still be able to buy it even though the price spent is quite large.
As I think the person who is more rich didn't care about the any price of any thing, he can only need the thing and sometimes if he didn't need a thing he can easily buy it without any tension or without any stress. But the person who is from middle class family or even in now a days due to inflation we have seen most of the people didn't manage their monthly things. They didn't even fulfil their needs.
So, this is the thing that mostly he considered means rich people can be as rich as when the go to any hotel or any other place where they want to go, the didn't face any problem in going there and they didn't have difficulties in spending money their, they can easily buy different type of things there without looking at the price of the things as given.