Board Thread:Questions and Answers/@comment-64.233.173.223-20150328005721/@comment-25968376-20150328175546

At first I was very conservative with the cabinet space, but since they dropped the price for expanding the cabinet to 30 Crystals, I've been expanding and going into collector mode, and just like you I try to keep one unevolved and one evolved version. Currently I have 140 slots, and I still need about 30-40 more for all the stupid B- and C-grade treasures that I get from tickets.

But there is one more benefit in having duplicate treasures (at least some of them): they are helpful for gathering achievements. I'm currently trying to get a third Grand Revival Donut so I can revive 12 times in Ghost Pirate's Island, or some combination of treasures that will let me run for 240+ seconds.