I bought his 80 frags to get the 3* ninja. It cost me 2200 ingots.
Id have gotten the Animal Path or Choza instead if you had ingots to waste but then i guess you got the ingots spare Iruka at 3 star isnt that much better than 2 star.
*... what's your saving secret.. with this many updates andpower boosting events it's getting harder to save them
Personally the monthly card is a huge source of coupons. 50 a day gives you something like 350 extra a week to spend, not counting whatever you'd get naturally.