Talk:Summer 2015 Crystal Bingsoo/@comment-25968376-20150630132159

Let's do more math to determine if it's worth upgrading this:


 * The maximum possible number of Crystals: 124
 * Average total of Crystals when unupgraded: 62
 * Average total of Crystals at +9: ~97
 * Difference: 35

Average coins to get to +9 (based on Punji's reply in this thread for chances and costs of Treasures: ~875222

This means that you're paying an average of 25 000 Coins for 1 Crystal while upgrading this treasure, provided that you get it to +9 on the first day.

Is 25 000 Coins for 1 theoretical Crystal worth it?

If we go the other way by paying for Coins with Crystals, currently the prices are
 * 55 000 Coins for 50 Crystals = 1100 Coins for one Crystal
 * 132 000 Coins for 110 Crystals = 1200 Coins for one Crystal

In other words, you're paying for 20-25 times what the game thinks Crystals are worth in Coins when upgrading the Bingsoo.