Also not being an investor, I agree with your ranking. Even better would be any sort of heavy industry. Elon Musk's stuff (rockets, cars, tunnels) is mighty nic

Also not being an investor, I agree with your ranking. Even better would be any sort of heavy industry. Elon Musk's stuff (rockets, cars, tunnels) is mighty nice. Refineries, 100-ton forges, container ships, and similar are all more impressive than software.