I feel like the phrase "coupon abuse" is madeup crap. A Business gives discounts in order to (hopefully) make more money, then try to ensure that we all see people who actually use those discounts as "abusers".

Don't fall for it.

It's not that complicated. If you are a business, don't sell stuff at a loss. If you want to sell stuff at a loss to drive traffic to your store, you're going to take a loss. Don't blame your customers.