Ill break it down like this, at a minimum of 2 stars per spin, with 20 coupons/ignots per spin, it would run you 13K Coupons/Ignots to get sage naruto, roughly $250 USD give or take.
He is not worth that much, seeing as with this sage treasure, if you get 40% off seal scrolls, you can get them for 75 a piece, for 750 per 10 pull, so chance of getting him that way, is much cheaper then lucky stars.
Someone can correct my numbers if im wrong.