It seems like you would have noticed that I have answered this question numerous times in recent years. Sports prefer playoffs because the TV NETWORKS prefer playoffs, and the networks prefer playoffs because they generate the highest level of concentrated interest. Do you think the NCAA expanded from an initial field of 8 to the current 65 because it was more fair? No. They did it because the networks wanted more games. Do you think NASCAR instituted "the Chase" because it was more fair? No. They did it because that's what ABC wanted. Playoffs are used and have been expanded over time because that's how each sport makes the most money through advertising.