Where can I buy your stuff? I don't know if your money works differently from mine but for me I get to own the difference between Cost and Revenue. Revenue inc

Where can I buy your stuff? I don't know if your money works differently from mine but for me I get to own the difference between Cost and Revenue. Revenue increase is not good if the cost increase is higher. I doubt that the revenue will increase, the costs will certainly. The costs consist of my time and the payments I make to build and distribute my stuff. This will reduce the costs that I pay to Apple but will increase the development and legal burden.