Yeah. if that's all that happened, you might have a point.
Ask yourself how they got the gold and how many children were enslaved for labor after the gold ran out, and how many were killed as 'object lessons' when people tried to resist. Just take a look at the Taino Genocide for an example of what I'm talking about. Spanish conquistadors were known to bash still-nursing infants to kill them. They fed natives to dogs. Burning a live and hanging weren't brutal enough, so they sometimes did both. At the same time.
sure diseases wiped out most natives. and they may not have known about it. but I wouldn't be shocked to find when they found out, they decided to make use of it. (I mean, we did.)



Probably make more in clicks and adds than they can make buying and scraping a very limited amount of probably-not-actually-pure gold.
Certainly less work.
(Edit: this is the irregular reminder to crack addicts and meth heads- flocke cameras have copper you can sell.)