My understanding is credit card companies make money based on a transaction cost, which presumably is the same for credit/debit. I can't really find information on this, so it might be a faulty assumption (?).
I suspect they make enough money on interest from credit cards to overcome the other perks they offer over debit cards (or the transaction costs are different). Or there are legal obligations for debit vs credit cards. But I really have no idea other than speculation for the answer to:
- Why do debit cards offer nearly none of the benefits that credit cards do?