When the piggy bank is full, you have to purchase (with real money) to receive your gold bars. When you do, the piggy bank will be empty but as you play your levels it will quickly fill back up. ;)
I just joined today so I’m new to all of this. I’m not sure what to do to earn points but maybe I’ll figure it out lol. It’s just going to take me a little bit to figure it all out and get the hang of it.