When I was going through the ZWD exchange before regulators killed the deal due to too many counterfeit notes and everyone got nervous without ink test to ensure the validity of its authenticity, 100T was exchangeable for $600k USD. 
No more than that. This was the deal like it or leave it. 
Anyone around currency speculation know the ROI here was beyond the norms. 
Their is a saying in wealthy circles. 
“Pigs get fat. Hogs get slaughtered.” Link