Well, something you have to remember is it's really easy for endgame shells to get bored for a while. For example, let's say we have a Endgame shell leader named Billy, and his subsequent shell "Billyshell". Now, in it's youth, Billyshell was a solely sky shell, and Billyshell members were happy. They got to get sky gears, and monies, and all sorts of fancy things. But then, most of the dedicated members got everything they wanted, and only kept coming to sky because they were dedicated. So, Billy expands the shell to Sea and HNM to get those dedicated members new loots. And everyone is happy. Except for the not-quiet-as-dedicated members who dont have everything from sky yet, or see no benefit to going to sea/HNM. So, Billy makes these other events manditory for sky, to get everyone involved, so the non-core members can get thier sky gear, and the core members get thier HNM stuffs. Everyone wins right? Except then the non-core members start getting miffed because they didn't sign on for HNMs, and the core-members quickly grow weary of thier bullshit/not having enough folk at HNMs. This, of course, wears down on Billy who becomes addicted to crack cocane. And then, in a coke induced frenzy, Billy developes an unhealthy obsession with Rose McGowan and starts stalking her. Several restraining order violations later, and Billy is spending the next 3-5 years getting the sanctity of his asshole violated on a regular basis.
The moral of the story: Don't expand your sky shell unless you enjoy being carnally violated in the poop shute.