Maybe, but its a bit like a 'No 4x4s' sign on a byway. The thoughtless actions of some people that usually cause such signs to go up in the first place,
tend not to take much heed of an unpoliced 12" square of aluminium with some writing on.
What I'm saying is that the real cowboys wouldn't waste their money on such a book anyway, so ultimately I think it wouldn't stop or
encourage them one way or another.