hello, thnx for the information !! keep it up !

On the power side it's worth it ONLY if you can make a good use of the medium refinements and/or the cave keys, so, basically, if you are under 70k power. When your average rune level becomes 6 and your average refinement level becomes 6 too then the event ceases to be worth the cost.

In my specific case, for example, if i spent 1500 coupons there i would have gained less useful power than by spending them to buy 3 advanced thread packs at 509 coupons.

You're correct but the thing is the events items change everytime like next instead of med runes they may have threads and also u c*so grab some good ninjas if y'all want to , like I would have had got about 15 Edo asuma Sdrags if I wanted to

there were always 2 problems with this event- 1st is that it's heavily redeemable dependant and 2nd is that it requires you to invest in batches of 700coupons. Paper value of items you get from tailed beast images is nice, but it doesn't neccessarily translate into noticeable gains- you get charms, adv threads, seals, mangatamas, tactics, myoboku, refines and mood scrolls. Im not diminishing it's value, however it's not enough to provide a significant change when you aim at certain rebate, because you get a bit of everything - kind of like lucky board - however in LB's case you have a solid power option (charms). It's like Garv said, while aiming for a rebate (and most of us are hoarding items and sometimes buying a little more when we are little off of certain checkpoint) we are better off buying a cave key pack, seal pack, thread/refine/whatever. If that event received some love in terms of higher quality power redeemables or less accessible things (adv refines, adv threads, optional tactics, seal scrolls) it would be actually good. Personally, everytime it's up I'd like to spend in that event but there are no redeemables to make it appealing for me.

I say doing 3 times "open all" is worth it, to claim aprox 170 cave keys from redeem.

Other items from redeem shop are not so worth

Well all events have their plus points but doing this event for multiple times is good I think cause u can do 21 times a week . So high spenders if they invest in this can get double their value and also if y'all do it about 3 times you could get about 75 medrefine runes with 30 tactics pages and some more items. Overall this event is not good for hoarding as u said but multiple times can sure be beneficial

Glad could be of help

if there were advanced threads or advanced refinement runes as redeemable items then the event would be worth also for me (if they removed those useless advanced cloths). Are 6 months i'm rank 6 BA and i'll continue to be at 6 because they don't give us ways to get advanced threads in an acceptable quantity.