Some who try to interact with the Zuma are responded to. Some aren't. This is not some whim, there is reason behind it which is quite clear and obvious if people bother to try and work it out.
I am not going to change the character of the Zuma because some people are frustrated they seem to get nothing from them or do not understand the point of them. Nor am I going to explain in Out of Character forums the reasons behind actions that some players are fully aware of.
If you want answers and interaction from the Zuma, learn how to deal with them and find out in game. Remember, you came to the Zuma first, they did not go to visit the humans. Also remember that it is not just some human realm run in the same way as human realms.
I get this, and honestly, I am not trying to attack you. I believe you when you say that there are reasons for everything. I have mainly been soured on the entire concept of NPCs in this game. They're too powerful, with too little return for the players in exchange for having to deal with NPC factions that can laugh at your armies and can, on a whim, tear down everything you have spent years building. I played the fourth invasion, and honestly I didn't care for it. BT was in a great place before it began, with an awesome continent-wide war. Now look at it - depleted player base with realms unable to go to war and expand due to lack of nobles DESPITE a massive loss of territory to the blight. We barely get any immigrants even, a fact which I partially chalk up to the sheer magnitude of the destruction. Those players whose favorite realms and characters are gone beyond the hope of reclamation have simply left for good, and won't likely be coming back any time soon. And what was gained in return? The barest hints of this deep, seemingly rich storyline, which thanks to a certain OBSESSION with secrecy will likely never be revealed in any meaningful way to the vast majority of players who suffered and lost so much in the course of it.
I joined BT because I thought the invasions would be fun. I was wrong, but now I am invested in the characters I have there. I will say this - if the realms on BT that I currently play in are ever lost to, say, the next invasion, I won't return either, and if I hadn't enjoyed what happened before the invasion so much I probably wouldn't have even stayed this long - I just hope we are able to build it back to some semblance of what it was. I have put time and effort into those realms, but I feel like I'm wasting it on the possibility that they will be completely destroyed in the next invasion by some GM's fit of pique without any explanation or fulfillment in the end.
As a result of all this, I sympathize with the neighbors of the Zuma, and I sincerely hope that they will remain an isolated curiosity. I really wish that they didn't exist at all. On BT you at least knew you were getting the invasions. The Zuma were sprung on us without warning.