But in this arrangement there is no reason for an individual need more points. You inserted your own assumption that "more imaginary points is better for itself

But in this arrangement there is no reason for an individual need more points. You inserted your own assumption that "more imaginary points is better for itself" to define altruism. Maybe an additional rule where the 20% with less points of the population of the groups with more points also dies. So there is actually an incentive for the individual that keep the points.