Kroger dropped double coupons in the Columbus, OH market a couple years ago. Kroger never had a senior discount here to my knowledge. But my memory is that Kroger only did it after Meijer stopped. Giant Eagle still doubles coupons up to 99 cents. I am sure Kroger loses some business to Giant Eagle for that reason, but overall, once Meijer quit it was probably an easy decision for Kroger.
Kroger runs a lot of "Buy X number of certain items and get $Y" promotions that start with a sale price that is only made better by this deal. I suspect that is at least partially funded by the vendors. Where I reside, an extreme grocery shopper can easily cherry pick Kroger, Giant Eagle, CVS, Walgreens, Target, Aldi, Walmart, and Dollar Stores with not a whole lot of effort. Add to that Sam's and Costco and it is a wonder anyone makes a profit. One Kroger benefit -- their Scan Right Guarantee. If it rings up wrong, it's free up to $5. I think their checkers are told not to offer it unless the customer brings it up. They first try to re-ring it at the correct price.
I get a lot of free stuff from Kroger due to their negligence in not having the correct price on the shelf. Last summer I got free bakery brownies for several weeks running. I snapped a photo of their shelf price on my iPhone to make it easy.
This was many years ago, and maybe not a valid comparison, but when I worked at the now long dearly departed Borden Co., a marketing VP thought that the revered Borden name could sell anything. They bought a successful BBF (Burger Boy Foodorama) regional fast food chain competitor to McDonald's. Then changed the name to "Borden Burger." In a few years, that was shuttered. I suggested they convert all that real estate to "Elsie's Premium Ice Cream" parlors but that idea fell on deaf ears.
They also bought up several thriving potato chip/snack companies. An attempt to convert to a "Borden" brand failed miserably. Here in Columbus, many still remember "Lazarus," in Dayton it was "Rikes," in Cincinnati "Shillitos," in Pittsburgh, Kaufmann's etc. Everything seems like a good idea at the time -- and perhaps it was, at a time.
Sam's Club has been discounting its memberships with dollar value purchase coupons etc. for some time now — I even got a discount for renewing early, so the 45/60 price comparison is not really accurate. Also, Discover Card has been running a 5% rebate promotion the past 2 quarters for Club purchases which is essentially Sam's Club as Costco does not take Discover Card.
Nevertheless, Costco has an almost cult following among consumers though from my anecdotal observations I think Sam's still has the edge on businesses, especially the resale businesses. Sam's basic business memberships are less than half that half that of Costco's. But the bottom line is that even if Costco loses some members, the total membership revenues from a $5/$10 increase will be a significant positive.
In their Sunday FSI ad, the prominent 10% off on the cover was positioned right next to a promotional offer for an LG Flat Screen TV. However, a consumer would have to read the fine print on the coupon to learn the exclusions from that 10% discount, which included LG Televisions. I wonder how many Target "guests" didn't learn of that until they went to a Target store and tried to get a 10% discount on that LG TV.