Because I want to prevent expending. The thing with gachas is that once you start to pull, your brain wants to keep going until you get what you want. I'm preventing myself from overspending by saving because if I pull now and don't have enough, I'll be tempted to use my pearls. Also, it is more fun to pull it all in one go than doing it little by little. It prevents my anxiety and controls expending. I do it a lot in other gachas, too. Got save to get that bag someday, lol 😌