One perspective goes back to the question of fees. It's commonly said that you don't want to see fees for access to information become a barrier to appropriate access. But a system or a regime of appropriate fee imposition rules under an access law can, to some degree, address concerns such as those you've raised, subject always to full remedial oversight by a commissioner who can relieve against inappropriately imposed fees that would improperly raise a barrier to access to information.
On March 11th, 2009. See this statement in context.