*nods* Four drafts is enough. Much better to move on than stick with an agent you could be revising forever for (and a book that becomes further and further from what you want it to be). I moved on because agent had said no to two different MSs (one which had had a complete rewrite). The irony is then I (certainly not intentionally) ended up revising MS2 along the lines former agent had suggested anyway... but that's another story!