No, just think about what you said. Exactly if the economy is at 100 again with 4 Chests you'll see. Then tell me why we got almost the amount of Auras like the amount of Thana's? Yea, because the drop is 0.01 you will need to summon
1.000 or 10.000 Thanatos to gain a Card if you want to look the calculation. I just came from school so I couldn't choose which is in right, since I have 7 hours math during the week.