Statistically, all matter on the scales we're used to is only found away from earth since the universe as a whole (including dark matter) is something like 10^3

Statistically, all matter on the scales we're used to is only found away from earth since the universe as a whole (including dark matter) is something like 10^30 times less dense than earth. So if dark matter is found independently of matter* there'd be on the order of 10's of mg of it in the whole earth which would seem impossible to ever measure via gravity. * Probably a huge if, it's just a thought experiment