No one joins a guild because they want to join a guild. Especially a raiding guild. There is only one reason to ever join such a guild. To get what you want out of the game.
Making friends? Liar.
Enjoying content with like-minded folks? Your pants are on fire.
Get in, get what you want, and get out. Planning to leave? Spend all your DKP! Can't get your alt into runs? Don't offer to run some alt-raids, just play alts in other guilds and leave the moment you aren't getting what you want. Don't like how the guild policies work? Quietly grumble under your breath and tolerate the guild stepping on your freedoms to get loot until you can't take it and bail.
WoW isn't about being friends or having fun. WoW is about greed.