> In a Casino, at some point you have the cold hard cash in your hands. This makes a big difference.

That's not what i've seen in modern US casinos. It's been a few years, but I remember people using cards for slot machines. The image I remember most was a man in a wheelchair with his card on a lanyard around his neck. The card was in the slot machine. He looked physically tied to the machine, never moving except for one finger on a button. It looked like something out of the matrix.