Exactly. Force players to buy the next ticket on the roll (without seeing it) and don't allow unused tickets to be returned. Problem solved.
I grew up in Maine and tickets are dispensed this way. Not sure about returning tickets, but knowing Mainers, I'd be surprised if they would take them back. It doesn't pass the straight-face test.
Problem not solved. A savvy attendant just checks the tickets on the end of each roll. If it's a winner, go ahead and buy it. Otherwise, wait until a customer buys the loser first.
I grew up in Maine and tickets are dispensed this way. Not sure about returning tickets, but knowing Mainers, I'd be surprised if they would take them back. It doesn't pass the straight-face test.