question about passwords

I was thinking about what a friend of mine sent me yesterday. it was a return on something i said about their tournament. they said they enjoy having me play and that it brings up the prize pool. my question is this.... railbird members have a lot of private tournies. are these tournies for rbs only or are the passwords a closely guarded secret like the freerolls are? just a question because if more people had the pws the prize pool would be bigger and more people would see what rbs are. just a question i had