One reason that people like the author might not be on a 'do not call' list is that long lists of crappy leads are often what gets passed to the new sales person [and what is recruiting other than a sales process?]. I mean why waste good leads on someone who is just learning the ropes and might screw up a slam dunk or why pass good leads to someone who may not be cut out to handle the high rate of rejection and will move on to a better match for their talents in a few months?