It isn't simply that they are OTC stocks - there are two tiers of OCT above pink sheets, and one below it. (Caveat Emptor)
The OTCPink market is the bottom-tier marketplace. Companies in this tier are the riskiest as deemed by OTC Markets. The companies are broken up into three categories: Pink Current Information, Pink Limited Information, and Pink No Information. The divisions are pretty self-explanatory, each based on the availability of the company’s financial information.
Higher tier OTC stocks can have share prices much higher than the minimum for the tier. It is not unusual for an OTC stock price to be over $30...