The games will cost more than usual so it will be extremely rare for someone who is new and looking to steal a password to obtain one in the first place.

I have (or will) change the default starting chips to zero for new members. They will then need to earn reputation before they can start earning chips and buy the passwords.

This will help make sure that fields for the games are low and only active members will be able to play them.

I suspect that anyone in the games will be active members who earned their way in and deserves to be playing!