So is there any particular reason why you guys don't let us know the details beforehand?

Someone already proposed two answers to this question and they are last minute changes on where items/ninjas will be and not allowing people to prep. If those are the reasons why Oasis won't disclose, of course they won't say so.

You can get most of those items in other events now, so why bother making a limited event like that.

That was a terrible deal,you can get seal scrolls from konoha discount festival or 80 coupons form sage key event and not to mention new shop update....you better get them monthly pack. Every time that event comes, there are not more than 50 people buying that pack in my cluster so we hardly get max rebate (after 200 buys I think).

TBH, I am waiting for next treasure; I got bored and spent all I have been saving on GNW.

PS:please get rid of bells and moboku scrolls and put purify protection*2 /coupons or at least normal purify runes*2-3.Maybe update the wheel to give Ay frags like that Ay wheel you guys put in 2017sh. Leave the susano frags to buy, so everyone can be happy.