Well, my dad a'h used to tell me about a great real estate opportunity he missed out on. He was taking a vacation in Cuba c.1958 and staying in a little pension on the beach. The proprietor was trying to get him to invest in a sure thing--a resort project on the Isle of Pines off the coast of Cuba. He declined.
I would be a much better investor if I used a rear view mirror. Most of us would. No use crying about it.
Rhodium, fwiw, is a platinum-group metal, similar to palladium. I think the Germans have used it in the past to plate guns on occasion.