I don't agree with you. I had a great experience in buying gold from gamekoo.
They need to verify your picture of credit card (you only can provide the last number), ID or licence and so on. They only verify the new customer and will keep it secret, when you buy the next time they will not verify anything. May be your card has some problems so they had to do something. I heard that some customers used stollen card to buy gold and then the card holder contacted with the bank to cancel this order, so the gameim lost money and gold. But I like this style, because I will not worry about my card stollen. If my card used by others the customer services will contact with me at once and verify it to me.It is very great!