what dilemma? .. explain it further so we can give you appropriate advice ..

Is it worth to spend 3200 coupons on him,or should i wait and save more coupons for better ninja?

Save since you can't buy 80 frags of him. Cost about roughly 5k last time I checked. For better use of your coupons, save even more for a meta worthy ninja.

he is in Konoha Gift Shop and he cost 45 coupons per frag,i have 7 frag and i need 73x45=3285,i cn buy him

What ninjas do you have? He isn't as usable as before. The only time I see him is with roshi. Personally, use the coupons else where and you could end up getting him free as a free pull, so it would be a waste of coupons.

i dont have any special ninja i was thinking to make team around him but i didnt get any rare from his treasure maybe he will be my first one,thanks for advice :)

What power are you? I recommend getting him bc hes great early, and hes vital for most of the higher ninja exams

if you are f2p, Sage Naruto is an amazing ninja. Yes, there are better ones, but then we are talking about 10k+ coupons.

Put him in a windmain team with a skill broken (or at least chase broken) Kurenai and enjoy your standard-attack-chaos or mystery on point-chaos.

He is actually worth it, and the price in the shop is a lot cheaper than what he was in Treasure of the Sage which was 65 coupons or so for each frag.

i won him from free pull,go someone else,not so good as i expected(maybe i will change my mind after i play him more)

Its better to save and wait to draw him.