When it comes to drunks being in the house we work very hard to keep all of them out. This is also is our "house", we live in it also.
Another anti-drunky reason here is the fact that most tours require 90 minutes from start to finish.
90 minutes is WAY TOO long of a time to have to babysit drunks.
If their bartender doesn't want to see them, they why should I?