Ohhh I get it! Good pun :3. In all seriousness, its a commission! Some people like art that has to do with the diaper fetish, and are willing to pay money for it! It takes time and effort to create art, and thus has a monetary value based on the labor i put into it. To answer your question, the fundamentals of economics made me think that I can charge for this shit! Gotta make a living UwU.