Hi! The thing with both Cursed Hidan and Jonin Minato is that you don't have to spend a large sum directly for them. The event Time-Limited Shop allows you to ac*ulate points based on how much ingots you spend and you also obtain rewards of choosing for doing your plot/elite missions. Although this may not be the best event for all players, it is an event some players like to have as a way to earn more for doing dailies and spending. There will be more events in the future which will allow you to use coupons to obtain the fragments of your choosing directly.

For example, not every event has certain fragments such as Sailor Sakura at the most cost effective price. Many players are aware of this and have chosen to wait for "Treasure of the Sage" which is an event that allows players to obtain Sailor Sakura at a discount of 30%.

It never hurts to save those coupons for events that work best for you!

~Jib