I think it is as yote said, 80% of the TOTAL guild members, active & inactive included !!!
I somehow understand why HCS does not get involved !!!
imagine you created & put 1000s of FSPs into the guild, then go offline for some time (be it personal reason, vacation, accident, ...) & when you return you find out there has been a mutiny & player/s raided ALL the items, gold & destroyed the guild in the process, happened in the past & players would post their tragedy in forum / shoutbox / FS Box
HCS does not know if that player (guild / co founder, leaders, ...) will return OR how much the players who want to start the mutiny have put into the guild OR what their "objectives" are .....