There's a very low limit for the recharges, so for both yours and ours safety it's better to get a new card with no history of transactions. We don't want it to be blocked or get any unwanted attention because of the high recharge amounts.
We charge 10% of the amount you want the card to be refilled with. It is a new feature, but you do not have to worry about anything, your safety is in fact our priority too. What if I want to cash out in a different currency than USD?