Would a promote-from-within policy be relevant to an organization that fills mostly entry-level jobs? Why or why not?

In a recent survey of organizations with an average size of 595 full-time employees, the companies filled 92 positions on average, with more than 70% of the hires coming from outside the organization.
According to other research, most employers agree that a program encouraging internal recruitment would help the company recruit talent. But many companies lack such a program, making promote-from-within policies a possible source of competitive advantage.
One innovator in this area is Tata Communications, an IT company headquartered in Mumbai and Singapore. Tata's HR department determined that many employees wanted the variety of experiences available to contract workers. So Tata set up a program called Project Marketplace that lets employees sign up for short-term projects, offering a new way to develop a variety of skills relevant to their career goals.