I'd like to start by apologizing for my "English," but it's not my native language and some language barriers may arise in this comment.
Honestly, I'm not a dev, but I think it's safe to say that ATA is breaking itself.
With "events" like this, ATA primarily finances the Black Market, more than it finances itself.
This is because, given the discontent of the players, there will be some players who will perhaps spend all that money, just to be able to sell shards and get bentoes and, at the same time, There will be just as many players (and, perhaps, the same ones) who will sell bentoes for real money to those desperate people who want to have the dorm and the 110/110 avatar. In short, fewer people will spend in the app, because buying bentoes at the black market will still be cheaper than opening 9 boxes of shards (if we pretend that with 9 boxes you can have all the avis without duplicates).
Furthermore, the game is now starting to get quite boring because it is more focused on finding a way to earn more money, on your part, than on the players' enjoyment and requests of the player base.
Upgrading and growing in the game seems almost impossible without spend money.
Even the trading prices within the game have increased because everyone is hungry for as many bentos as possible to be able to buy, trade, everything that is not affordable for them. Until recently, you could buy a 999 for 15-20

, now for almost the same amount, you can buy a recycling 999.
You should consider making all events accessible to all players, with a free and a paid option, a bit like with story passes. In this case, I would have done an event like this:
- Once you've obtained an avatar, you begin this special quest, which requires you to complete the dorm. Once completed, you'll get 60/60 avatars.
- By obtaining all 7 avatars, however, at the end of the quest, you get the 110/110 avatar.
This way, more people would have spent. Not just those who can afford to spend hundreds, but also those who might have spent to get 200 ecs. There wouldn't have been all the discontent that ensued, you would have made more players happy, also creating something different. Instead, even those who can afford to spend hesitate a little because they feel cheated.
As for the originality of the event itself, I don't really like the avatars. They're a bit of a collage of the avatars you get with Pluto and the current Animal Soul Shards.
That would be fine, if it weren't for the fact that you ask players to talk to you, conduct surveys, do and say things, but then you don't want to listen to our needs and requests.