There is a difference between inflation and hyperinflation. Hyperinflation is not too much money or not enough money to spend. Hyperinflation is a loss of confidence in the currency (ie, people immediately exchange the currency for something real). Money’s component as a store of value is what prevents inflationary episodes from happening. Imagine, if everyone believed that whatever cash that they hold would lose 50% of purchasing power by the end of the year, they would more than likely go ahead and spend it now instead of when 50% of the value is lost. That's the nature of hyperinflation.

The other component necessary for hyperinflation is a competing currency. In Zimbabwe the locals switched to dollars when their native gov’t currency failed.

From the article: Most of the gold generated by the ruthlessly productive, rapidly adapting bots found its way to third party vendors in a black market which undercut the prices in the sanctioned, in-game auction houses.