Because participating the stock market isn't risk free. Even if you are 100% correct (an impossibility) that a stock ought to be valued at a certain price, the

Because participating the stock market isn't risk free. Even if you are 100% correct (an impossibility) that a stock ought to be valued at a certain price, there is no guarantee that you can place your orders at the right time in order to make a profit on it minus transaction costs. There's a common saying that goes loosely: 'the market can stay irrational longer than you can stay solvent'. So given that likelihood, its not surprising that some choose to take a guaranteed payday by writing an article, instead of going forth and rolling the dice.