Yes, I am developing a product to sell, and I hope it will become a profitable venture. I would not pay for Qt's commercial license if it was just for hobby projects. (For clarity, it's not necessary to buy a commercial license for Qt just because I want to sell Qt-based products, I could do that under the terms of the free LGPL license, but there are a few nice extras that come with the commercial license and I consider them worth the expense.)