When it's a deal someone "allowed" you to have, the margins are generally those where you GOTTA know your stuff and "thread the needle" for profit, or reap the consequences.I will add we are no longer in the "Digital Age", that's done, happened, over and beyond.

Typing a 16 digit card number is annoying, and by making yourself type it every time will force you to think about the item you are purchasing more.