Because there are almost as many writers in the U.S. as there are readers, publishing houses are overwhelmed with manuscripts. To help screen out the junk, the major publishers only accept manuscripts submitted through a literary agent. For the unpublished writer, it's as hard to secure a literary agent as it once was to find a publisher. The catch-22 is this: To get published one needs a legitimate literary agent. To get a good literary agent, one needs to be published.