Then it disadvantages people who don't want to be in a clan or who don't want to clog up their friends list. People would get rewards just for posting on a forum, whether or not you created an arbitrary barrier to mean you had to wait a week, or join a clan. RNG might not be perfect, but it is 'fair' in that it indiscriminate. That can be annoying when someone with 10% of your hours gets the drop you want, but that's life.