I am pretty sure that would be a big "no". I have never seen a poster or any advertising like that in a casino in Vegas, ever. They have their high end advertising billboards that can have large ads installed behind glass, and electronic displays, but I have never seen anything like a poster simply tacked to a wall or pin board.
The only place I have seen some posters on the strip at all is when they are building a new building on the strip and have wood barricades between the construction and the sidewalk, people sometimes put up posters on those, usually to advertise escorts...