Why do debit card companies want you to slide your debit as a credit card?

I signed up for this chase extras promotion crap. And apparently, to gain points, I can only swipe my debit card as a credit, in order to get points. Why is this the case, and why do so many credit/debit companies encourage you to swipe your DEBIT card as a credit card and sign? Thanks, all answers are appreciated.

Public Comments

  1. Because when you use a credit card, the merchant has to pay a fee, which is usually 3% to the bank. So...this way the bank makes more $.
  2. The reason is that the fees earned for debit card use are negligible. The fees for credit card use are close to 3% of the transaction. Personally I refuse to own a debit card because you have absolutely no protection.
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