The only thing I buy tickets in advance for are Encores! shows (don't know why since they always end up on TKTS anyways) and a few shows that I just really really want to see and there is no way I'm taking chances with ticket availability (aka LOVEMUSIK last season, DEAD MAN'S CELL PHONE this season). Of course if you know the show is going to sell out, definitely buy tickets in advance (WICKED, JERSEY BOYS, perhaps even SPRING AWAKENING).
"Some people can thrive and bloom living life in a living room, that's perfect for some people of one hundred and five. But I at least gotta try, when I think of all the sights that I gotta see, all the places I gotta play, all the things that I gotta be at"