I think you could make an argument that it was some of both. It was the sweaty PJs who were the main market for monobaths, before color was thing in newspapers, no question, and the enthusiasts who have become the comeback market for that niche product, but I knew people who were developing and printing color at home in the mid-1990s, when you could literally get your prints back in an hour within a fifteen minute drive from any address in the city I lived in.