Though I hold out little hope of successfully explaining the contrast in meaning that "macaron" has lately acquired (US pop culture understands the word differently from its standard meaning in France and French cooking), still the pricing quirk in this story seemed worth asking about.

"$2 for one, $13 for six, $25 for 12" is, respectively, a per-piece price of $2, $2.17, $2.08. I'm guessing there was an error somewhere, otherwise that's an unusual approach to quantity pricing, no matter what the item's name!

I'm guessing the macaron pricing is due to the box (that you wouldn't get with a single macaron). They are priced like this in the fancy pastry shops in Paris too.

I asked in person and was told yes, the quantity pricing includes surcharges for different packagings used.