Is it safe to use your credit card at an online bingo site?
You take out your credit card. Its still in your hands. You type in some numbers. Again, the credit card number is still in your hands. You hit the OK button. And then boom. The money is in your account. And yup. The card is still, you guessed it, in your hands.
In some casinos you might be able to find what are commonly known as Multi-player Slots Bonus, on these machines, the only difference is that when you play the maximum number and hit the winning combination, you get the bonus.