But while writers like Mary Morris consider the blockbuster mentality something of a sickness in the book business, others insist its a measure of health.  Some of the worst cynics tend to be people who maybe are never going to get published for a reason, says Nicole Aragi, the superagent-of-the-moment who brokered Jonathan Safran Foers handsome payday.  Aragi embodies the blockbuster mentality better than most.  She claims not to bother with midlist clients and takes on at most one or two new authors a year, and then only the superhot (she also represents Junot Daz). 