Your maths is wildly off in my experience. We had 4 tools for custom parts making ABS plastic parts made in 2013. These were considered hard tools and produced

Your maths is wildly off in my experience. We had 4 tools for custom parts making ABS plastic parts made in 2013. These were considered hard tools and produced over 100,000 parts each across 5 years and cost us £30k made in the UK in about 4 weeks after material was available. The parts were each around the size of an adult fist and the tools were multi impression. They weren’t large enough to have any hot runners (I think I’m remembering that term correctly) but they did have movers in them. If we had wanted to make the parts out of PVC we would have had to use stainless steels tools from memory and that would have been more expensive.