I have an amazing "how to win at video poker" tape that appears to have been self-released in the 80s (hand-typed label, blank cover). I should really digitize that shit.
The key point is that they take ONLY dollars (except the ones that don't). Vegas casinos are desperately trying to give money away to people, but are stymied as tourists spend hours jamming nickels, quarters and buttons into dollar machines laden with cash, ready to burst. Unfortunately these tourists become thirsty and leave at around 2:59AM.
The fact that during the "Magic Edit" at the beginning he just steps off to the right and you can see his shadow sums up exactly the amount of trust I put in this man and his advice.