Famed AdWords expert Perry Marshall wrote a blog post about this subject titled Fact vs. Fiction in the Guru Biz. There are a few successful NFL coaches who never played the professional game, but darned few.  Four notable examples are Vince Lombardi, Bill Belichick, Mike Shanahan and John Madden.  But even these four coaches played at the college level and Madden was drafted by the Philadelphia Eagles but never got to play because of an injury. So what does this have to do with B2B marketing?  There is an old expression that goes, “Those who can’t do; teach.”  B2B Marketing