Nothing wrong with having a bank account.
The situation with bank accounts in South America is not the same as in North America/Europe
@Noire Alouette: We've been working on increasing the numbers of payment methods in South America lately. I am not quite sure if this have been extended to Argentina yet, though.
Be aware that if yes, it will only be possible through the in-app cart and not from the website, where the payment methods are basically the same "globally". I will check it for you anyway.
BTW, which product you are interested in purchasing?