PK/OTC stocks are the riskiest, yet the majority of people who "invest" long in them end up losing money. The only people who make money are the insiders, their accomplices and promoters who perpetrate the scams and some of the traders who know how to play the momo if/when it happens.
PK stocks like MDGC are not investment grade -- most are scams. No retail longs are getting rich off of MediaG3.