A friend of mine told me that when she was young her mom use to tell her that the reason Santa Claus got her more presents than her mom did was because her mom had to go to the North Pole and pay Santa for the presents.
I don’t know if this was something that was common to say in there family or not. But it is a good variant of a story everyone knows. Everyone knows the story of how Santa Claus brings all the children presents on Christmas. I don’t know if this variant has an origin. I don’t think it does. This comes from my friend.