All of this presumes that the person making these costs $0 per hour. Turning hobby into a business is rarely a successful scenario. This screeches to a halt, t

All of this presumes that the person making these costs $0 per hour. Turning hobby into a business is rarely a successful scenario. This screeches to a halt, the moment that you put into perspective. My typing this is equivalent to a few dollars, because most people here have at least $50 per hour engineers. Designing PCBs for existing modules(ex. ESP32) takes a very long time(and a lot of knowledge) and it's not just "put this chip here and have software figure it out".