you need 2 games to win a match, your opponent only needs 1 game to win the match, the previous game was the crawford game so you are allowed to double again

is there ever a reason not to double at the first move ?

what if you need 3 games to win the match, your opponent only 1, and its not the crawford game ?
i sometimes wait until we are a bit further in the game to see if i can scare him to drop (or lure him to accept) .. but i never know it has any use ?

what if you need 4 games and your opponent only 1 ?