because they see the company struggles and is not loyal, as top performers have plenty of options they will be more likely to take a better offer when it comes along. Top performers will not leave the same day but bleed out over a bit longer timeframe. The most popular example is woz hesitating so much to leave HP because HP was loyal to employees and woz was loyal to HP. Imagine the same situation when HP had just let go 10% of employees, he would not have thought about it twice.
