For this wager, you assume that the dealer has a hole card of 10. If
indeed, it was a 10, you get a 2:1 payout. However, you lose your bet if it is
a different card.
At first, this may sound profitable. But not in the long run. It is
because, there is no assurance that the dealer will always get a 10.
Wagering for the insurance is advantageous in certain occasions, but not
enough to help you leave a footpr1nt in blackjack.