We all get 1 million just means that we just reset the value of the currency and a gallon of milk now costs $3,000.
As far as the elements. Hydrogen and oxygen are in abundance but clean forms of both gases do hold value. Gold, silver and Platinum are less available and this is reflected in the cost. Except silver which is being manipulated. Elements in the 115ish to 126 serve currently no purpose other than for scientist to is themselves in the back when they are able to produce a stable sample, some of those have yet to occur.