Because he's good at 3/4 stars.

I wouldn't say $1000 good, but that's my opinion. I mean that's roughly drawing Tendo, Hashirama or Ay. All of which in my opinion are better ninjas.

they are not xD... have you tasted narutos sweep at 4* or his mystery?? i bet not... ay tendo or hashi are way more lower than him believe me...

I think it depends on the usage
Hashi is godly in 3v3 PvE (including ranked) and damage races(fox/coin trial)
Tendo is good in any 3v3
9-tail naruto and Ay are more for 1v1, Ay being on par with 3* I'd say, 4* is probably stronger.

Overall, I'd rather 9-tail naruto higher because there are more 1v1 PvP stuff in the game than... well... other stuff so it probably gets more uses.

6tail naruto (4*) is leagues and miles stronger than Ay, it is not even close. It's like comparing regular 1010 to a 5* gnw 1010; that big a difference. Ability to brute force through healspam teams is a pretty big deal, something Ay can never dream of doing.

Tendo is strictly for 3v3s. He is amazing at 3v3s, but really awful in 1v1 combat. Hashi is good in 3v3s, and useable in 1v1s for specific lineups; but not any better than regular rares like mei or danzo for said 1v1s.

4tail naruto (3*) is still quite decent, and is definitely one of the strongest ninjas. (It also gets me quite a number of instant forfeits in matsuri ;P)

As far as super rares concerned, Ay is probably the worst one. He is only good at stomping much weaker players (or punching the coin cat), and not even good against equal power players in the current meta.
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Regarding the price.. pretty sure Time limited shop is the worst place to buy chakra naruto. He costs something like half as much per fragment in other events where he is available...

Pretty sure 6 tails naruto is unofficially God Tier somewhere compares to Hashirama, Tendo and Ay.