actually i'm accusing the author of conveniently calling the NLJ250 a meaningful category for no really great reason. this chart would look totally different if we used, say, V20.
He chose it because it's teh best delineator between good jobs and crappy ones. Your suggestion, to use the V20, is preposterous. You don't need to go to a V20 to make a good living. There's not really much difference in the work you do either, when comparing a V20 to a V90.
His explanation: Why is the NLJ 250 a good barometer? Because the . . . weighted average (based on firm size) starting salary at an NLJ250 firm for 2007 was $152,424.