Ok, am I missing something? Did not BG already have gift cards? My bride got me a nice one for our anniversary back in June.
She wasn't able to order it online. That's the difference.
Instead of having to hope your relatives or friends drag themselves to the store and ask whoever is behind the desk for "Ork 'skribble' Boyz" or a "Space Marine Plane" or some "Imperial Guard guys" or any of the 23984083420843 ATO items that we "aren't allowed" to put on the wall, now they can get you a gift by just typing in their CC number and letting you pick what you want. It's especially helpful to those of us that have friends / family that aren't local.
Just send them the link and let them do the rest!