This is no good if you reduse the drop rate. Its trickry to get players to spend money. Or a cheap way to get players to stratigise to use their energy at certan times when it doesnt matter. I used to pull 5 shards give or take, every morning in canteen, today during double i did not get a single drop. This is only ONE example of how my personal drop rates have decreased. Dont fall for the double drops with half the drop rates.