The points represent chances of a positive outcome. They symbolize the nature of cooperation. 
I'd agree that that part of the experiment is not presented in a very illustrative way on this video. 
Took me a couple minutes wrap my head around it at the beginning. 
For example, working on car washing gets exponentially easier the more workers help each other. If they do the job separately it becomes a tedious and inefficient process. You can measure how much time you can save by cooperating. 
The number of points given to each action are arbitrary but based on real life situations.