Most people who want to go into Fort Aspenwood and Jade Quarry do to get faction points, and getting faction points is a grinding experience. A battle in Fort Aspenwood always goes as predicted due to what I call "herding barriers" - the gates and hallways that dictate the Luxon avenues of attack and the Kurzick choke points of defense. As a result, a particular build can be designed to take advantage of this setup, whether a Luxon ranger with Edge of Extinction or a Kurzick monk with Life Barrier.
The difference with Jade Quarry is that, as you've noticed, it is much more open-ended and plays like an alliance battle. That, however, means that the people who wish to win more frequently will choose Fort Aspenwood over it, because in Fort Aspenwood they can set up to do something that will all but guarantee a victory unless the other team happens to have a counter.
The Kurzick side actually has an advantage over the Luxons in Jade Quarry, because the quarries are positioned closer to the Kurzick starting positions. Unfortunately, the Jade Quarry is also much further from House Zu Heltzer than Fort Aspenwood is from Cavalon, and the Jade Sea is much easier to run than the Echovald Forest, so very few Kurzicks actually make it to Jade Quarry, and even fewer stay after completing the primary quest. Coupled with the fact that Jade Quarry is a coin toss where Fort Aspenwood can be skewed, Jade Quarry is chronically underpopulated on the Kurzick side, and the lack of battles turns even more people away.
I recently posted
The Winner's Guide to Jade Quarry on these forums to provide an overview of what to expect in Jade Quarry and how to prepare for it. I firmly believe that more would come to Jade Quarry if they knew what they needed to do to win. After all, winning is a wonderful feeling that most of us enjoy greatly and would like to repeat as often as possible
If you want to do something about the current situation, I suggest this: get your Kurzick alliance to challenge a Luxon one to Jade Quarry "duels" one night a week. If you can do that, you'll be able to earn faction points while also building a rivalry and making the battle more personal for yourself. What better motivation is there to boost your alliance's standing with your faction than the taunts of the other side?
