I have only been in the casinos here in Indiana, but twice I have seen groups of folks just snapping off a quick shot and they were treated like criminals. I wouldn't think a photo shouldn't be a problem If casinos want to keep a fun, vacation type atmosphere.
Also, I enlarged the one Frasher photo and the chips in front look like" Dotted Wheel" and "Four Arrowhead" design generic inlaid chips.