Sid, fucking softball fanatic that he was, would just not go to events unless he was 100% guaranteed to be used and even then he spent like 6 months selling farm equipment rather than showing up to raw tapings because the money was that much better.
In order to get Sid to be there day in and day out they had to offer him guaranteed paydays regardless of use, the first contract of that kind. The very existence of that contract strengthens Nashs position significantly and leads to it becoming standard.
Wow... I never knew Sid was able to strong arm that.