Here is how guild writs work.
When you complete a standard city/guild writ, you ear, in your case, 1500 status points. Those 1500 are personal status points. The amount contributed to the guild is 1500 divided by the number of patrons (P).
1500/P
Suppose that your guild has 20 Patrons.
1500/20 = 75
Each writ you complete contribute 75 status points to your guild as long as you have 20 patrons. More patrons means less status per writ per person that gets contributed. There is a minimum number, I think it is 12. So if you have only 5 patrons, you are still getting your earnings divided by 12.
The fewer patrons you have (ideally 12) the better, since having more patrons will increase the divider. It is a lot easier to get 12 people to do write frequently than it is to get 30 people to keep doing writs.