I think the rebuttal misses the point of the article: the problem isn't just that humanities Ph.D.s don't make enough money, it's that they have a very difficult time finding jobs doing what they've supposedly been trained to do, that is, be full-time humanities professors. Someone who has taken several different adjunct positions in order to make ends meet may not have the energy or the resources to do the research that he presumably loves & has made sacrifices for, and won't have the freedom that tenure supposedly provides to take risks in his writing *or* his teaching. In other words, being interested in what you're doing isn't necessarily enough to let you do it.