Why is it that if I choose a $2.69 cappuccino for my free drink from a DD Perks award at Dunkin' Donuts, I have to pay separately for an extra "turbo shot" of espresso, but they are happy to give me a $4.79 large Frozen Caramel Coffee Coolatta absolutely free?

No charge for whipped cream or the extra drizzle of caramel, either. It makes no sense, but I feel as though asking the counter staff to explain it or countermand the policy would be pointless.

It's a stark contrast to the Starbucks free-drink award policy, where you can pretty much assemble whatever ridiculous drink you'd like from their menu and available add-ons, and it's Just Plain Free.