Talk:Versions/@comment-122.148.42.159-20120205200836/@comment-3991817-20120206015706

That 80% was an estimate of mine, as there seemed to drop about 5 or 6 crystals every round of collection from the 7 Casino Crystals I had.

The collection scrolls might indeed speed up the collection of the crystals, but you can also buy those for €4 per crystal from the Build menu, last tab.