Not everyone is a die hard neckbeard that plays/raids a full xpac cycle non stop. Personally i lose interest in (scheduled) raiding when cleared the current tier on HC and got a certain gear level where upgrades would become quite rare or very lucky. I assume many players handle it this way and obviously most guilds are pure raiding communities. no raid no guild. personally i join a guild to raid and when i take a break i either gquit by myself or i get kicked because of inactivity. That's how it goes.