... what special benefit do I get from points?
Suppose a shodan and a fifth kyu decide to engage in some tanto randori. Both belong to the same organization, and have so both have had to meet the same time/technique requirements before earning their respective ranks, respectively. Also, neither has had any martial arts background prior to beginning aikido. Now imagine that the fifth kyu scored dozens of points, while the shodan earned little to none. The special benefit is that the shodan has learned that he should probably put some extra effort into improving what he already knows.