This is generally true, unless the Board are all friends -- then friendship dynamics can come into play.
"He's my friend, and I don't want to be seen to be betraying him... and I think he's probably going to vote to ban this guy... yeah, he hates his guts... I mean, they only need two votes out of three... I don't want to upset my friend... it's a sealed ballot, but I don't think I could keep something like that secret.... Yeah, I'd better vote for a ban... and I'd better vote to share it with other cons too, just so it doesn't sound suspicious..."
This is generally true, unless the Board are all friends -- then friendship dynamics can come into play.
"He's my friend, and I don't want to be seen to be betraying him... and I think he's probably going to vote to ban this guy... yeah, he hates his guts... I mean, they only need two votes out of three... I don't want to upset my friend... it's a sealed ballot, but I don't think I could keep something like that secret.... Yeah, I'd better vote for a ban... and I'd better vote to share it with other cons too, just so it doesn't sound suspicious..."