I used 720 coupons to get Iruka... since I'm full f2p.. This is good for us. That's why is always good to save coupons. For things like this... and not for gambling things.
Yes, a lot of players got Iruka on this event because most of them were already saving for his fragments from the events that we had from the past. A free player getting Iruka would only mean that this game provides option for non spenders to be part of the game.