Innumerable financial and accounting schemes, all legal, also dilute your share of profits. Accounting tricks include non-deducted stock options, accruing unearned sales and commissions, classifying big losses as nondeducted special items, and counting pension gains as income. All tricks make earnings appear higher than they really are. Creating huge reserves in a bad year is common as well. This allows the company to then post high earnings in succeeding years. Many companies also use cash flow to speculate in the stock of hot companies. This boosts profits quickly, though it turns a solid business into a volatile investment fund. Companies also finance purchases by shaky customers. This boosts sales and profits in the shortterm but leads to huge write-offs later when the shaky customers fail.
All these accounting tricks inflate profits short-term. Higher profits justify higher salaries, bonuses, and grants of stock options. When these tricks are discovered and set right, earnings are restated and your stock price collapses. However, bonuses and salaries are long gone and stock options cashed. A series of legal accounting schemes can siphon off all earnings and leave the company bankrupt and you holding a worthless stock certificate.
Enron is a recent example. Enron used off balance sheet entities to inflate profits and enrich management. When the tricks were discovered, the stock price collapsed; outside shareholders ended up with penny stocks.