Why create a static field for a static property? Isn't it enough just to state that the property is static?

Answer 1

As I understand it, static members (class bound members) can only make use of other members that are also defined as static.

Answer 2

A static property is a property not a const. The advantage of having a getter and a setter is being able to validate the value before accepting it.

You can assign any value to a field.
If you have a property you can validate if you want to accept this new value.