Drop rate is beyond F..ked i tell you. You know i personally experimented on this event for the past 3-4 months (Ever come across MiddleEarth groups in latest servers? Yep that was me working it for WoF). Made 24 accs in a server, 18 in few others took them to lv30 and focused on this one. Around the time when there was Kakashi Summer/Juugo stage 2 on it, it was easier to get the ninja. Out of 24; 6 accs got Kakashi Summer. And out of 18 accs in the newer server, 4 got Juugo for 1 to 2k coupons at best. And then there was Mei Festival. From 18 accounts i spent a total of 90k (5k each) on it. Nothing. I wasn't aiming for jackpot in the first place, i just wanted to get Mei. But nope.

I bet a grand after seeing how many people started to get 2nd Ninja on it, they clearly rigged this event. Because only whales are allowed to enjoy good stuff.