People who are not naturally competitive (or who don't like competition) struggle to understand the drive. For many, competing against a computer is FAR less engaging or rewarding than against a person. Even if the person is less skilled than the computer. The human element - chance, variance in skill, emotions, etc - is very motivating for some people. The same people often like sports (which I do not). If you replaced every athlete in every competition in the Olympics with a robot, would you still find it as compelling? Some would, but many would not.