so my understanding is,

Not all the coins are used to claim stake, so these portions and the one you mined as a result of staking will be put away for several hrs(or number of confirmations to be reached)

Until then rest of the coins in your wallet will continue staking and rinse and repeat above steps.

so having 1 mil coin doesn't mean you get 1000s every stake mine. you may only need a couple of hundred to claim a stake.
However, due to the number in your wallet, the chance of claiming raises significantly higher than say normal airdrop user of 5500.