Sometimes the management is clever enough to realise it's much more cost effective to keep your knowledgeable employees happy than to have to go through the process of hiring replacements. Sadly there are plenty of ladder-climbers and egotists who don't get this, and that's even when they consider the workers they're fucking around to be highly skilled. When the powers that be consider their employees to be easily replaceable then they lose all motivation to treat them like anything other than human resource.