A simple point system in WordPress. I like this function almost *too much*. Please use it wisely.

simple_point_system.php

<?php

function update_user_points($id, $value){

  $points = get_user_meta($id, 'points', true);
  $points = $points + $value;
  update_user_meta($id, 'points', $points);
  return $points;
}