I bought 15 million shares of a penny stock for a tenth of a penny per share (cost: $15,000) and sold them at 1.2 cents per share, realizing a large gain. But rather than be satisfied with that gamble, I bought another 15 million shares when the price dropped to a third of a penny. That cost me more than $50,000, and I lost it all when the company shut its doors.The bakery outfit's quarterly results were hurt by the rollout of a new pizza product