[To say that keys under $1.50 are carded is speculation, and I would rather assume that the person figured out how to duplicate the keys, or various other legal mechanics to accumulate bulk keys.
If someone is interested in a very organized, and profitable business opportunity, send a PM.
Either way, have a great night everyone and thanks for your replies.
This is not a "legal mechanic", I can assure you that any trades you make with keys of this nature will be reversed. You will either be screwing yourself or those you resell to over. Anyway, good luck.