I've never had a PSC. I always choose power stones for any daily reward, VP chest, submarine dives, etc. Now with the destroy option you get 3 fragments every time. Beats the PSC often enough. Very early on I remember crushing a 75% PSC, not even realizing it was perfect at the time. I build about 9 to 12 masterpieces per month and have 30 powders currently and use those powders frequently enough. The point is... its not worth it for casual players in the blue/green camp.