No Limit Texas Hold'em : preflop all-in with AK & AQ ?

[RyoSaeba]

Hi,

At the beginning of a tournament, I am not sure of the value of going allin pre-flop with AK and AQ. You have got only 6 cards which can help you, strongly, but only 6 cards. And you are underfavourite against pocket pairs. But the reward can be worth of it. How do you think ? What about calling allin with AK & AQ at the beginning of a tournament ? If noone is in the pot ? If there is some limpers ? If there is a raiser ?

Same question about cash game. I do not think that it is correct to go allin preflop with AK & AQ. I mean, if you raise allin, you will be only called by AA, KK, QQ... If someone raise and you reraise him allin, he might fold if he does not have a premium hand and all you would win is the pot (or lose your stack if he has a better hand)... If someone goes allin after your raise or before you play, this is sure your opponent has a strong hand...

What do you think ?