Sit n Go – Survival is the key
The key of sit no go is survival to the later stages. If you double up early on, and you are big stack and 6 people are left (in a 6 max ), it does not mean you will win it. In fact, if you accumulate a big stack early on you need to be careful not to play too loose and chase any loses.
The key to winning SNG is the later stages where the money is.
Double up early does not double your money like in a cash game, what counts is that you survive till the end where there is the money !