Talk:Summer 2015 Crystal Bingsoo/@comment-25386610-20150626183011/@comment-25968376-20150626183638

When unupgraded the treasure gives an average of 1 crystal/day, which is already one of the highest generating treasures. Upgrading it to +3 with coins is guaranteed, and this is enough to put it in the top. Whether or not you want to go higher is up to you. I was quite lucky with only two fails from 4-8 but going 8->9 was a real pain that took at least 10 tries for me... as long as you don't use Crystals, you will still get a profit from it.

Edit: I added a column to the table which shows the expected income from each level.