It's just a theoretical value that philosopher's use to avoid the subjectivity of utility when making an argument. They are well aware it's subjective, but the

It's just a theoretical value that philosopher's use to avoid the subjectivity of utility when making an argument. They are well aware it's subjective, but the subjectivity of utility is agreed upon and not of interest in these thought experiments. When someone says, "if I had a million dollars, I would take a trip around the world!" you don't chastise them for not having a million dollars. Well, unless you're my mother ;P