wait, 10% yearly is 0.027% day so with 3000 you should get 0.80 and not 7 coins if i calculate right
I think he is either lying or just mistaken. I have +- 3500 onions and I have never gotten even close to 7 onions in one day from staking.
He is not lying, i have only 603 coins in my wallet and i got 6.14438356 ONIONS in staking on 29th august 2017, whose details are given below:
Status: 21192 confirmations
Date: 8/29/2017 14:47
Source: Generated
Credit: 6.14438356 ONION
Net amount: +6.14438356 ONION
i was also amazed when i got that much coins in single staking and hope that i got same everyday but now i am getting .70 onions on an average.
If you don't hit a stake for a few days or even a week than it can be possible to get a big stake like yours maybe because your wallet only runs for a few hours a week.
Or you get smaller stakes on a more regular basis.
nSubsidy = 10 * nRewardCoinYear * nCoinAge / 365;
More nCoinAge - greater reward.