Just as everyone else mentioned its totally luck based. I recharged 1000 ingots, got 10 tries of which 2 times got itachi, 1 time got 500 coupon, 1 time got 100 coupon. That was the best case scenario that has happened to me in shinobi feast wheel. Next i recharged 5000 ingots on the same day, to only get 1 itachi frags. And one thing i have observed is the first spin has a high probability to be 100 coupon. These are my experiences with that event, you can get better results or 10 times worse.