Aion Riftshade

Quick question about GP contribution, I was in a siege defending Pradeth and attacking Silona while I had the Value Boost pack and AP Boost active! We have successfully defended Pradeth and most of the people I was in alliance with got 200 GP from contribution and I got 100, and on Silona ppl got from 100-200 while I got 50. Now I know I have to kill the NPCs as well as the opposing faction which is exactly what I did, yet some people from my alliance got twice as much even though AP is distributed evenly most of the times and I know I was very active in killing both NPC's and PC's. Is there something I am missing as contribution scaling has always been a big question mark for me.

u didnt do enough, means others did more than u and were higher on the rewardlist for siege.... u shouldve sneaked urself some more kills etc. then, u`d get more too...