I believe many people will tell you that they start their carved cakes at $4-5 per serving.
I don't know, how much did it cost you, and how long did it take? I could tell you fifty cents, or 50,000. Without knowing your expenses, and how much you would like to make it's a moot point.
You did a great job on that cake ~ it has visual moment eventhough you carved him standing still, very cool. I also really love his smile.
You didn't ask for a critique or feedback, but I couldn't resist. He's just adorable.