>>16697266
As has been said it's very rare, but price is usually driven by demand and only in recent years has their been an increased commercial use for Rhodium (still not a lot but more than there used to be). That then meant more people mined it so the price dropped again. That is typically the main reason why asteroid mining is not going to happen any time soon: you spend billions to bring back an asteroid that contains a trillion tons of gold (or some other rare, expensive metal), only now gold is no longer rare and so becomes worthless.