The employees working at the company, collectively, have produced, maintained, and distributed the product. When the product sells, any profit (the money left after operational costs and reinvestment) was generated by that labor. It isn't all that complicated. That money, under capitalism, is siphoned off by a class that only exists to steal this surplus. I'm sure you'd counter with something about mutual funds and retirement accounts. However, this same class also steals from those dividends as well via fees and set percentages.