Is it bad of me to make and give away extra coupons?

Stores provide coupons in order to get shoppers to come into the store. By bringing in extra for people to use who are already in the store is, well, not nice. Remember, any store needs to turn a profit or they have to close. If people who would have paid a higher final price are given price cuts through your coupon, aren't you in effect raising your own prices? The store has to make money somewhere. If they are giving away more money than they expect through their coupons then they have to raise prices somewhere else.