Probably I'm late to the party, but try your best to make a transaction with a signed user @bitmover. That will enable you to also have a elevated account limit[1] on the payment method that you've used, which in turn will allow you to buy more bitcoin per day. However, as others mentioned, there's limits on the amount that you're able to buy, which is directly tied to your payment method - see here[2] for more details.