I used to work at Starbucks. It's the most ridiculous thing ever. Here's a hint for all you NS people.
Lattes are more expensive than cappuccinos because it has more milk. They are both essentially the same thing, expresso, and steamed milk, except the cappuccino has less milk and more foam. So if you want to save money order a "wet cappuccino," which has less foam and more milk like a latte. And never buy the food there, it's been sitting in that display case for awhile, not the freshest.