I think this weeks event are from the best i can remember.
I quitted playing for a long time and recently came back. As my seals are going to jinchuuriki treasure and I already had sage naruto, i really needed to have killer bee.

Recharging 500 ingots per 7 days (3500 ingots total) I will get:
-80 frags of bee, 105 cave keys, 140 coupons, and a couple of seal scrolls
-35 wheel spins, while half of the rewards are coupons.. i got the 500 coupons once already, and 100 a few times, which is insanely good
-A lot of shurikens,which will grant me the refine runes i was needing to power up
- The 4 frags of TENDO which i needed

Not to mention the f2p events which gives an additional of useful items like stam pots needed for me to collection materials and seal frags.

Guys, if u don't like this event, it's because you are a lvl 90 with 150 ninjas.. you don't need experience, you don't need anything. Just stop playing until they release a new treasure..
This is a week for all of the small spenders (in the eyes of oasis) and i'm grateful for it.. i will get exactly what i needed!