I haven't actually done the method, because it is a bit immoral to me, but it is definitely something that can work. I have a feeling this will get fixed sooner than later but as of now I haven't seen this technique before and most likely the market isn't saturated yet.
It is worth the $15 if you don't care about working the support system a bit. You will get at least several of these 12 month cards.
Probably has something to do with social engineering right?