Remember that these 50, 25, 10 points are extra points being given to an Association depending on its final position in the tournament. But Associations also get points for every win (3) and draw (1) during the tournament.

So, technically if you have more people in the Association you can indirectly get more points for tournaments. The final prizes are the same (50, 25, 10) but you play more matches so more changes to get +3 and +1.