It does amaze me, and has for many years. So many companies either struggle for months, and months to find new hires, or spend on expensive processes to hire, and then practically forget about the new hire after a few days induction. However you recruit it's expensive, a combination of cost and time expense, not to mention the lost opportunities, or increased stress of coping an employee short. I can of course demonstrate how executive search is great value. But if you neglect on boarding, you risk wasting your money, however you spent it. At the very least you delay your new employee being reaching full productivity. 

On-boarding shouldn't be a few days with HR and a chat with the CEO, it should be a thorough process, as outlined here. Or if you are a client we can share our many years of experience.