I know what you mean Kathy, I didnt understand at first but this link might help: https://care.king.com/en/blog/article/what-is-the-piggy-bank I buy anyway so guess its just a few extra ontop of what I would normally spend.
I've seen an update about this on the front page, here: https://care.king.com/en/candy-crush-saga/candy-crush-saga-facebook-update might give you some help.