so found a few things regarding the gacha.
1. most of the rewards from the gacha are the new polaroid pictures, followed by random weapons and cards. considering the best weapons available right now seem to be the bows you can get from chests, if you don't want pictures, you can probably ignore this, however
2. it is possible to get 100kY from the gacha, ensuring you don't need to grind in the dungeon anymore (and you can summon it with temperance cards, which are plentiful drops)
3. if you decide to spend 10k on the gacha, it'll spit out so many balls it'll crash your game, so, like, don't do that. RIP my 100kY fresh save....