I don't have a problem with people collecting coupons and using them. They put a lot of work into what they do. If a store doesn't want to accept them, that's also okay with me. I do feel that anyone who uses a coupon, should also use the product that the coupon applies on.
I do have one problem. I don't like to be in line behind someone using a wallet full of them. It's almost as bad as being behind a person with a cart full of groceries in the 25 items or less lane.