The thing is, inequality doesn't really mean much on its own.
I'd rather we have most people in the country earning around £20 k, and some earning £100 k... than we all be equal and equally starving to death like the Russians were under Stalin.
Theoretically, if we redistributed all wages equally, everyone would earn £27 k (the average uk wage).
But it is only fair that extremely skilled jobs such as surgeons, or aircraft pilots for example, end up earning more than the average shopworker or receptionist or something.