BLiTZ is correct, aside from the attack. Casual gamers are people who turn on a game and play. They are not going to spend additional time browsing websites about the game or trying to coordinate anything - they probably don't even know that these websites exist that help organize raids. If you don't provide built-in mechanisms within the game, then that feature isn't going to be used by casuals. I've ran into quite a few that don't even know what the Grimoire is or how to access it - they are intelligent beings but gaming is not a top priority in their life so they don't seek out any additional information outside of what is on the actual game disc.