The first (and stated) effect of this policy is to weed out the unmotivated employees. However, Dan Ariely has explained that the secondary effect is potentially more powerful. For those that choose to stay, they will forever live with their past action of having turned down lots of money to work there. So, when they're having a crappy day and hating their job, they're probably thinking "why didn't I take the money a…
It's classic reverse psychology.