I often read people saying they want to earn enough money so they don't have to look at price tag of product. Imo, even if you are rich you wouldn't want to spend money on things that are not worthy of price being paid.
What they mean is that they want to earn enough money not to concern themselves with the price of anything they like because they can afford it and any other luxury that they desire.
You wanna look at product and then it's price, if it's worthy of price, you purchase the product.
Very rich people do not always buy things because it is worth the price, they buy things because they first like it.
You can sell a plain white t-shirt to a rich man at a price different from what you will sell to someone in a lower financial class. To the rich person, they may not care about the cost because they really like the T-shirt and need it, but a person who is not so rich will think twice and want to try to get something cheaper if he perceives that the T-shirt is too expensive for him.
Rich people who are very calculative in spending are the rich people who worked hard and hustled to be where they are, rich people who were born into wealth calculate less because they have no idea what it means to struggle.