I wasn't trying to imply you were complaining. You asked if anyone knew
why the discount didn't apply to the sampler packs so I was answering that aspect of your question. There are plenty of places that seem to just arbitrarily disallow discounts or randomly exclude certain products from specials, and those places always irk me. And the discount is not necessarily obvious on Mom and Pop's sampler packs if you don't do the math.
Besides, these
threads are open to everyone, and someone might come along in a couple days, weeks or months and raise a ruckus because they weren't satisfied with the answer