Talk:Fate/Grand Order Fes. 2017 ～2nd Anniversary～ Lucky Bag Summoning Campaign/@comment-26193235-20170731101522/@comment-26270104-20170731103836

I'd suspect it's because of an age restriction lock on your account preventing you from spending over a certain amount of money on quartz each month (Translation of middle part: "Below age 15, within one month/up to 5000 yen", and below it the game showing you you've bought quartz for 4720 yen already this month). An option that was there the first time you went into the quartz shop in-game that you had to choose from, as I recall, though I can't recall off-hand from where you could change it afterwards to have no limit or such.