I am pretty sure, that like with all loss leaders, there is a limited amount available at the loss price, per person. And with S&H, there may not be a net gain, which is where I am thinking the profit will lie.
Also look for the words “on consignment.” If you see something like that you may be buying into a long-term affair. The loss leader is just the beginning.
Woz tells a story about this. He buys the sheets then has them bound book style, three notes to a page, with perforations in between. Then when he wants to pay, he pulls out his “checkbook”. Crazy.
Wozniak got interrogated by the Secret Service during a visit to Las Vegas because they thought he was counterfeiting $2 bills. It took a while for him to explain he bought them from the government and it was all legit.