Yes it turned out to be, but did we know it at the time? If you bought gold during the CA gold rush, how did you know there wasn't 50 million tons of it waiting

Yes it turned out to be, but did we know it at the time? If you bought gold during the CA gold rush, how did you know there wasn't 50 million tons of it waiting to be dug up? Turns out you would have done just fine buying gold in 1850. Bitcoin's supply is definitely limited.