There is an interesting theory about why some Minneapolis real estate agents complete so many more home purchases than do others. It isn’t that ‘success breeds success’ (although the thing we call “momentum” is certainly real enough). It has to do with being able to harness two somewhat opposing character traits. 
In any business, there seldom seem to be any irrefutable rules that guarantee prosperity…or if they do crop up from time to time, they don’t work for long. Since that’s the case, it’s odd that there are so many best-sellers proclaiming roadmaps to success. If all those books were simply rip-offs, you would think they’d quickly develop a backlash (which would kill the market for books about succeeding in business).