AtaaKumaa

Ever since I have a premium membership, no matter what amount of USD I have on my account (and I make sure it is enough), they take out all that is on my account for payment of the membership. Whether I put 10 USD or 20 USD (or more even) onto it, it's gone. From what I understand, the membership fee is about 9.50 USD, a fixed amount. How can it be that no matter what, it's cleared out completely?