The amount of time it takes you to create a US Dollar isn't how you would measure the cost of something. It's strictly based on the value of that item. And with .0015 Bitcoin being equivalent to just over $1 USD, it's not much markup. A k-cup can easily cost $.75/each.
0.0015 Bitcoin = 850 Dogecoin (I just looked it up) ... less than a day of mining on mid-to-high-end current or last gen AMD Cards (79XX, or R9-280X+).
GPU mining Bitcoin has been unprofitable for like over a year.