I am a premium player, but recently, after many horrible gacha rolls, I have decided to stop buying gems for this game. With all the back-to-back events that we have, we will have a full harem (um...army) of 5* girls in maybe 5-6 months. This will make 93,5% of rolls from the premium gacha a complete waste and garbage.
I find it strange that the premium gacha mechanics, the primary incentive for buying gems, have so bad odds. It is so bad that it have convinces me to become a freemium player. I will maybe buy gems for these guaranted 6* or 5*, but I will not longer flush my money on their gacha, only use free flower gems from events and log-in card on it.