A Cliched Milieu?

In today's New York Times, Janet Maslin makes an unintentionally funny remark in the middle of a review of the novel The Starboard Sea by Amber Dermont. The novel is set in a prep school. Janet Maslin calls prep schools a "cliched fiction-writers milieu." No shit! Do you ever wonder why, Ms. Maslin? Could it possibly be that so many novels chosen to be published by the big New York publishing companies, and designated to be reviewed in the New York Times, are set in prep schools? Is that why they've become a cliche? Either prep schools are all today's fiction writers want to talk about, or possibly, just maybe, the fiction writers chosen for publication attended prep schools. Take your pick.