I was never instructed to "leave the penny issues alone." In fact, I was pretty much left on my own with one instruction to concentrate on dot com stocks trading NASDAQ at the time.
For a brief time, in the final stages in 1999, daily volume on the OTC:BB exceeded that of the NYSE and NASDAQ.
Andrew Miller, a junior high kid from California, was, for a brief time, the star stock picker of non reporting companies. He even enjoyed a brief 15 minutes of CNBC fame.
On the opposite side of the coin, one could say, were folks writing about the perils and pitfalls of speculating in non reporting companies. They received quite a few death threats, as I understand.
He looks at you like you owe him money.