I've only gotten gold so far, anywhere from 90 to 180 or 190 something I think has been the top so far.
I'm unsure what others have experienced, but that's been my personal experience - it's still worth the 200 crowns in my opinion. Plus it looks cute in my fire wizard's house, on her dining room table.
It gives a nice chunk of gold daily. Today I got 190 gold. It varies but has been between 100-190. Way better than the magic fishbowl or magic tree house. ...or doing the maze in the Acropolis basement and getting 25 gold and sometimes a low level snack or seed to go with it. To steal Anecrobie's line-"-it's like a pot of gold" under the Christmas tree. Well worth the 200 crowns.