But you didn't do better than minimum wage. You could have just done a bunch of TaskRabbit or Odesk or Elance gigs and for the same 26 hours ended up much farther ahead.
What does that mean? Perhaps not much because it's comparing apples and oranges (contract / service work vs. product sales). Or perhaps it does mean that you need to understand the value of income (not just revenue) with relation to time cost. That might actually be the biggest lesson here: yes, you can build something you can sell. And perhaps you learned how hard sales is, but how possible making a profit is. But most importantly, you learned that not all businesses are worth it. And this one most certainly is not worth it.