There's two separate meters to fill. The personal gauge, that is capped at 1200 guild points per week, and the guild's one at 36000 points per week. If you max out on the personal gauge but there's still room in the guild's one, they count towards the guild's total points. Likewise, if the guild is maxed at 36000 points and you're not at 1200, you can still play for your own points. Basically they are filled the same way, but they have no link between each other.