To add some more evidence to my previous post, I have the following hypothetical situation.
Let's say you join a raiding guild. You always show up on time, perform flawlessly, bring consumables. You are online before invites start and at the entrance to the raiding instance. You are the top performer in your class/role. You log out when the raid is done. You don't talk to anyone and you never converse socially.
Except in some rare situations, you will never be considered a valuable member of the guild. So socially expectant are guilds, that being non-social is a problem. I'm not talking about being anti-social, just being quiet and doing your job.