I want to do print on demand but analyze: is POD actually profitable? Map POD economics: base costs, printing fees, platform fees, advertising costs. Calculate: if shirt sells for $25, POD costs $12, ads cost $8, what's profit? Show me the POD truth: margins are thin, need volume for income. Give me the POD strategy: these products, these platforms, this pricing. Include: whether POD is profitable after all costs, what margins to expect, and if POD is viable business or side hobby.