Did you buy that just so you could do commissions and thought "yes, I'm going to earn that money back solely by doing some shady copyright art" -- because if what you're drawing doesn't belong to you, it doesn't matter what it cost you to produce that piece of art. It's your choice to purchase expensive programs and supplies. And what you produce is technically not yours to sell. It's a different matter if you use your stuff to produce and sell original art, obviously!