These jobs, which require students to prove financial need, serve as pseudo-scholarships, enabling some students to afford college. (Greg Gottesman, Daniel Baer, College Survival 7th Ed., Peterson's (2004), p. 212.).
But once we are willing to allow one kind of pseudo-scholarship a foothold, the main rationale for closing the gates to others must logically come from judging the motivation behind them (Scott McConnell, 'When Pretension Reigns Supreme', New York Post, 22 May 1996, reprinted in Alan D. Sokal (ed.), The Sokal hoax: the sham that shook the academy, University of Nebraska Press, 2000, p. 87).