I think it's more like: girl joins linkshell, girl starts cybering with male ls members, girl joins vent eventually, girl has very manly deep voice... , male ls members want to die in a fire.
On a more serious note: In WoW when ingame chat was introduced people still used out-of-game chat. It's nice to have the chat not being dependant on the game, because when your game crashes you can still communicate (tell others you're dcing & hear from others when you can get back in), very convenient during events.