A standard pre-flop opening (2.2 - 3.5 bb) is pretty much the usual in a cash game.
In a tournament however, the norm is to get all the money into the middle pre-flop. The lower the stakes, the more likely it is that a standard bet will be called by too many hands. The more hands in the pot, the more often you lose to a lucky draw. There's no guarantee of course - I've saw a hand recently where both AA & KK lost to 72s (who hit 222). Why did the 72s stay in the hand? Many amateur flush chasers (especially those in the blinds with a tiny amount already invested in the pot) will call just about any bet pre-flop.
Most bigger pairs and AK, AQ, KQs are going to call just about anything pre-flop in a micro-stakes tournament. If you are lucky you will end up playing against AK, AQ & maybe even an AJ. The more Aces playing, the less likely they will appear on the board.