Prompted by a reader inquiry, I did some research a few months ago about coinless slot machines. Wired News has delved into the topic with a report on the continued adoption of the “Ticket-in/Ticket-out” system which is replacing the clatter of coins. These newer machines save labor and time. Gamblers aren’t shying away from them, though some dedicated coin droppers dislike the loss of the metallic sounds of money changing hands.