I think OP severely underestimates how much time actually goes into preparation for a raiding guild.
Also, I DID raid in a heroic guild during WotLK and Cata. I worked at my job 0700 to 1800 and then came home, started prepping for raid, and ordered a pizza from Papa John's online. During boss pulls I would run to the door, pay the guy, and stuff my face. Did that routine two to three days a week for several months. Granted, that was a lot of fun and many memories were had. But that shit burns you out hard, and you FEEL like shit too. Fuck that.