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It is not, and the gambling casino's business shouldn't be protected by law.

This isn't a case of slot machines where they got the logic for the house edge wrong. This is a case of double redeeming winnings because the machine would give you your winnings but not mark the ticket as redeemed.

Depends on the nature of the glitch. Machine adds an extra dollar to every ticket? User is probably blameless.

In this case is sounds like there is an extra action to exploit the machine - insert tickets two at a time, and then insert one of the tickets again.

Not a perfect analogy, but if you see a store with a broken door, you're still at fault if you start looting.

I always thought the "bank error in your favor, collect $200" in Monopoly wouldn't work out in real life.

Bank Error In Your Favor. Pay $200 and go to jail.