The only really good hand lineup to see when you're all-in preflop is KK vs. K2off. In this match up, KK wins ~92% the time, but any other hand vs. other hand the odds of your hand holding up is not so great. AA vs. suited connector is like 66% - so 1 out of 3 times you will lose. With variation, you could easily lose 10x in a row to suited connectors, which is why all the winning tournament players RARELY push all-in preflop and EVEN MORE RARELY call all-in preflop.