I remember when I first stepped foot in to the moors. Nobody knew me out there. And I didn't get invites to any back then when I asked. So I just ran around throwing WS stuff at creeps and dying. Once I started coming out there often enough people started to know who I was, and low and behold the invites started coming.
So, I say this to the greenies. If you don't get invites don't take it personally. Just keep coming out till people start to recognize you. And if you're good at playing your class I'm sure you'll get invites.
Personally, I have started to enjoy soloing out there or duoing. It's freeing being able to do whatever I'd like to do.
And yes, I do see people grouping with certain people. Whether it's tribe/kin only or friends. That happens everywhere in the game. Why should it be any different out in the moors.
Getting off my soapbox now.