The main reasons why they never ask for a password are:
1: They already know it. 2: Even if they don't know it they wont ever need it to access your account. 3; and lastly they probably don't even want to really know it because of posible privacy rights attached to such things.
I wish you goodluck, Personaly i will probably play this game till blizzard decides to cut power from the servers :P Has it already been 4 years? Somehow it feels more liek 2... But maybe that part of becoming old. You start losing track of time and before you know it you lost a year :P once again g...