This is my personal experience on Chaos shard, although I'm certain the good folks on Order have had their fair share...
I'm not an overly chatty player and I'm not a nasty player. If someone asks for help there is an excellent chance I'll drop what I'm doing to assist. Tough mob? Okay. Hunting comps? No problem. Need a portable silo? I'll grab my disk.
That being said, there are a LOT of players on Chaos, both old and new, who see no reason to thank others for their assistance. No appreciative nod, no words of thanks, not even a friggin "please" will escape them. I thought thanking others, for taking time out of their play to help you, was commonplace! Silly me, this is the Internet, anonymity means people can be uncouth hounds!
No wonder some players focus inward, there is zero appreciation when they go out of their way to assist others!
*deep breath* Whew, I feel better...