You actually only need 1 Coinz Key to withdraw, but this is only for FaucetPay which should have been added as a payment option months ago imo. For Direct Wallet payment you do need 100 of them which could be a struggle for a single user which is why I feel like Jamboom added the FaucetPay option.
What difference does it make?
To withdraw the value of $1 you need 100 keys, whether to FaucetPay or elsewhere, what's the point of withdrawing single pennies while from FaucetPay to your wallet there's a higher limit, meaning you still cannot get your money, you just get it stuck in a different place?
Not to mention how senseless it is talking about "withdrawing" with values < $10.