This is a pretty common occurence in a lot of tournaments I play in. When you are playing at the lower levels like 5-20 dollar SnG or small home games people see an Ax and cannot wait to get their money in the pot.
Yes it's true you are 70-30 to win and therefor I would push KK here as would most other people I know. Like they said most of the time you double up but you have to realize that about 1/3 times you're taking a rough beat and seeing that A.