Hmmm .. I wanna give my honest opinion but first, i want you to understand that i don't mean to be rude or whatsoever, no offense but i'm gonna comment in every line you said .. as well as some of my suggestions for some parts of that event ..

"What do they expect a late gamer like me buy here?" - This event is not special or intended for late gamers only. This event i assume was laid out for the whole population of players, means both for old and new players of the game. Some of the players still don't have the items or ninjas in that event, due to some of the players doesn't have enough resources for them to buy a 5 figure ninja or expensive clothing. Now for the old players like you who has all the items in that event, it's now up to you if you're gonna spend or get some fragments to upgrade your ninja stars to 4 or 5 stars, if you don't need it then don't get it.

"16 fragments of a ninja that in china was given out for FREE in an event specifically dedicated to her and the other two sannins and that here appears at the 'modest' cost of 10000 coupons?" - CN Naruto Online and English Naruto Online is managed by different Company or Teams so do not expect that every things or events in CN will be the same with our servers here in English ..

"10-11 fragments of ninjas like minato and deidara i just own?" - Yeah, you already own them but how about the others who's still in the process of piecing them .. Like me for example, i'm still halfway to recruit both of them ..

"medium threads when i'm close to rank 7?" - Not all players already ranked their armor near to 7 .. So again, it's your choice if you're gonna get it ..

"mystery gems when i have 37 sitting there after having unlocked all of the available ones?" - with this one, im gonna agree with you and the others .. This item is obtainable for free by just having enough Group Points to redeem it from Group Shop .. So there is no other reason for them to be there at that slot, maybe it is better if they put the Breakthrough Stones of the other Summons like Katsuyu's or Monkey king's for us to upgrade our Summon's Mystery Skill ..

"butler outfit that i just own since 3 events?" - Not all players have good resources like you to buy such Clothing at its first or second appearance in event ..

This is the usual comments and reactions of some players, who don't want the things in the event .. Please always remember that the event's concern is not always for those players who has already have all or old player .. The event's concern and target is to cater the needs of the overall population, old and new, and being one of the old players means the option is with you .. They're only being fair to Old and New players of the game, same for the in-between of the said players ..

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Hokage Minato i guess?

Ohmy, sorry, my bad .. i didn't notice the sannin part and only read the "guess which 1 out of the 3 ninjas I can choose to get 80 frags?" that's why i thought is the 3 ninjas that is available in the current mobilization event ..

3 Sannins, then if that is free then i would guess, i think it's either Orochimaru or Jiraiya but i have more confident with Jiraiya ..