I just want to say that this isn't only a problem with bigger guilds, but it feels like noone seems to bother when someone from a smaller guild asks for help on help chat. When a player from my guild for example (yes we are close to 100) asks something in there he immediately gets told to ask in his guild. And while I have to admit that we had a past with random invites and lots of inactive players (that's why I left for a while) this is not the case anymore. Still players from my guild get bashed immediately as soon as they post something on help channel.
Sometimes we just can't answer a question, especially when it's late at night and only few people are online, or people think they'll get a quicker response when they put it to help channel. And it's really not nice having to deal with people then who just tell you to go pick "a more helpful" guild instead of actually helping.