If you are at a table at the WSOP where there are multiple players pushing their stacks in the first level and you are folding AA, I dont fancy your chances for the tournament, unless of course you get moved to another table, where there is a bit more play. You have to consider that if there are these types of over- aggressive players at your table you arent going to get your opportunity to play much poker. Better to take them out, send a message to the table and accumulate a monster stack in relation to everyone else. I dont believe many professionals would fold AA preflop, in the first 2 scenarios, and have heard of professionals such as Phil Ivey going allin, first hand, blind. I guess hes doing it for fun or a bet, or just wants to send a message to the table.