Much of the reason surely lies with football's simplicity. The offside rule excepted, anyone can understand it in an instant.
There is also inherent drama in a game in which goal-scoring is usually difficult. That drama reaches a peak when a penalty shootout, surely the most compelling viewing in world sport, is required.
Football is also unique in the way it appeals equally to men and women. For the most part, the "beautiful game" raises no safety concerns.
Football's governors also orchestrate an event that ensures excitement and high emotion are ever-present.
Even they, however, could not have scripted Brazil's demise. But this was just one of many surprises. Teams that look like champions one day play like chumps the next.
That says much about the difficulty of winning the World Cup. It also accentuates the drama and enchantment of this most brilliant of sporting occasions.
It is no wonder people cannot get enough of it.