Lucky Star is a great event....usually the best offered amongst the others in the week--but if your asking for investment advice, I wouldn't base your decision on the ninja you'd get from a lucky spin. I've seen players walk away empty-handed after spending thousands of ingots--infuriated because they thought they had a guarantee at that ninja. Most of the time, you won't get it--and by that, i mean...you should count on NOT getting it.

In my opinion, the value of the event comes in the form of the reward redemption ninja...this week Roshi, Mei, and Danzo. If you're really hurting to recruit/upgrade and can't wait for the treasure pull...then this event is amazing...we're talking about 80 coupons for a danzo frag...that's like 30-40 frags for him by the end of the week...that's a pretty good value (not to mention the items offered)

...however, if you're only casually collecting their frags and don't critically need them, then i'd skip Luck Star this time. Your coupons would be better saved for the Daily Special or Sakura's Gift

Personally, I'm gonna get some Kushina frags this week so I can 3-star her...no luck involved, just straight-up saving :)