My bosses usually wince at that sentiment, probably because I'm underestimating how much overhead is or something, but there should be a number that makes it worth it, right? And if the guy ends up being smart and reliable, you could ask him to retrain for a job with more responsibility.
Am I missing something? How else are we going to get all these unemployed men retrained in another field, especially growing ones like tech?
If you measure the value of the employee by the salary you pay him or her, the ratio of total costs incurred by the company to value derived by the company for this one employee increases as that employee's salary drops. This is one of the major reasons that temporary jobs and part time work have become popular solutions to this problem: the indirect costs associated with these types of hires are lower.
What we really need, in an ideal world, is a set of personal benefit programs (health & life insurance are the big ones) which are completely uncorrelated with your employment status or location. Forcing employers to shoulder the burden for personal benefits leads down a dark and dysfunctional path where the programs are not controlled and managed by those who have an interest in them for what they provide, but by those who have an interest in minimizing the costs of such programs.