Sport is competitive. Ther very point of competition is to determine who is the best, whether it be a team or individual. And while there is an element of entertainment and drama that comes with any sporting event, the structure of a competition should be geared towards to providing the fairest method of determining who is the best competitor.
There are other factors. It must be exciting, it must also fit in with the general sporting calendar, especially the schedule of that particular sport, and fans have to be attracted to it to make it commercially and financially viable.