At a lunch-time discussion, some of my colleagues wandered into a subject that brings tears to the eyes of marketing executives: mistakes. Not minor gaffes, but money-wasting, product-killing, even career-ending mistakes. As we shared our war stories, some major themes emerged. Much of the marketing waste and carnage we’ve observed has revolved around one of five fundamental problems. We call these blunders the Five Deadly Sins of B2B Marketing. See if they resonate with your own experience.