God forbid if your employees are happy.
In all seriousness, I don't even remotely understand this mindset. Why would paying your employees less than they deserve or less than is optimal encourage them to "stay hungry." If anything, this is going to deter them from working inordinately hard or may drive them from the company altogether. If a company pays well, the employees have more to lose and are likely have a greater appreciation for their employer.
I just can't fathom how they expect that, by paying less than they ought to or less than their employees deserve, the employees will be more inclined to work hard.
This speaks to a fundament misinterpretation of employee motivation and is incredibly disquieting.