I don't think anybody knows the passwords people are using on these sites.
They have to get reset, not sent back to you as the system doesn't know and the Admin doesn't know either.
This is how it works here and most likely everywhere else. Dino can confirm the setup on the other board.
The only thing a rouge site admin or mod could do is take over your account by changing your password and then posting as you. You would then need to sign up as someone else and inform people before you got kicked off again.