Hmm... So is this what's occurring with every active Linkshell/Linkpearl throughout the game? If I'm understanding you correctly, similar to a shout message, a Linkpearl would be the same in regards to the information being sent to the servers and broadcast across every zone to all members in possession of one whether they have it equipped or not. Meaning with all the different LS's running around every server, shouldn't that too equate to the overload you're describing? If so, wouldn't it make sense to limit the number of LS's? Let me know if that's the same thing.

My concept would be coded to act similar to a Linkpearl rather than a /shout message that is designed to reach everyone.