I am away from the office

I am on "vacation" for the week and won't blog. If anyone is wondering why I am not updating.
Querry: In the song "Santa Clause is Coming to Town" there is a line:

He sees you when you're sleeping
He knows when you're awake
He knows if you've been bad or good
So be good for goodness sake

Isn't the whole point that you are being good so Santa will shower you with riches? What is this "goodness sake" nonsense?
Happy Eighth day!