Everyone who doesn't have more money than he needs, yeah. Good for you that you don't need to worry about money, but not everyone is that lucky.
When there are times when you just can't afford to fill the tank of your car, you start to notice how much gas costs. When your flat is the cheapest you could find, you know exactly how much it costs. And so on.
Sorry, but your comment sounds a bit condescending to be honest. "What, people actually know how much they spend, and on what? Why would they pay attention to such trivia?"