Can't see how it could work out like that. Do you have any proof?
You can find the payout each day here
https://oracledoc.com . People must understand that your earning is based on the difficulty of the pool. Today the difficulty is 4x harder than three days ago so you earn less. That is how it works on all mining. If you had mined btc 10 years ago with a gpu, you could get thousands of coins but today you will not get anything with gpu.