I don't quite understand the OP which is why I asked how much for the $50 card.
Does it mean you want an extra 10 % of face value or you sell then at 10 % face value.
$50 cost $55 or does a $50 card cost $5 or is it something completely different ?
On the card $50, I sell it for $55 (that is, I add 10%)
Why would anyone pay more for gift cards than face value? This model does not seem to make sense to me.