I read an online interview that Dutch Boyd did and he said players do best to avoid going all-in in tournament play. In the 2003 WSOP, he said he and Chris Moneymaker only went all-in one time in that entire tourney.
He said , lets say you have AA vs 22 . you win . again AA vs 22 you win. again AAvs 22 you win. forth time your opponent makes his set. Your done.