....which is where providers and hobbyists looking for a scheduled, researched encounter are prevalent -- NOT those looking for a spontaneous hookup!!
With no disrespect intended, the ladies here are of course going to discourage the "casino girl" methodology -- it potentially takes business away from them!
While I prefer to do my homework and end up with a well-reviewed TER or P411 girl, I've done the CG pickup a few times in Vegas, and once in Biloxi. It can be exciting, a "thrill of the hunt" sort of thing. And if you play your cards right, you'll likely end up with a cheaper price than most TER girls. Now, in many cases, you get what you pay for.
My advice: even for a "spontaneous" hookup, do some prep work. There are sites which feature CG discussions -- where/when to find them, average costs, etc. Also, make sure your room is ready BEFORE you go looking. Lock up your extra cash, your laptop, your ID, your other valuables. Make sure there's nothing in the room worth stealing, and only keep out the money you intend to spend. Some guys even separate their money, with a few hundred in their pockets ("this is all I have!") plus an extra hundred or two stashed in some non-obvious place in the room.