I don't know of any gamers who go into a store and buy a game, and do their grocery shopping while they are buying that game. If your kmart store is anything like mine, I certainly hope you aren't doing your grocery shopping there! Most gamers go buy a game, pay for it in electronics then walk right out of the store, so they can go home and play the game they just bought.
Soccer moms, sure they might grab a game for their kids while doing their grocery shopping, and ideally this is the customer that retail stores want to target with the games as the games are just supposed to be a lure to get you into the store so you will buy something else with your game purchase. But I don't think this type of consumer was exactly taking advantage of the Kmart promotion.
Along with the coupons I assume the purchases also stacked with SYW rewards as well, netting even bigger discounts for purchasing games at Kmart.
Kmart is a ghost town lately here, even worse than ever, their holiday merchandise was untouched going into Xmas, same with Sears, they both had tons of stuff left after Xmas even, and it looks like no one ever even shopped at either store for anything over Xmas. Its actually pretty amazing to see when every other store here was struggling to keep up with the rapid pace of shoppers during the holidays.
I would love to only be able to buy loss leaders when I go into a store, unfortunately I am responsible for grocery shopping for a family of 4 adults, and there are times we just need stuff and we can't wait for a sale. However I stay away from most luxury items other than groceries, food, consumables and toiletries. I try to do the stockpile but that only works for certain items. Due to the popularity of extreme couponing many of the items I need to get at the stores with the best prices are always out of stock when I have a coupon for them. I also buy a lot of used stuff on ebay, including games, often netting me much better prices than any other retail store could offer since retail clearance for games is pretty dead here. $20 game at the store or a $6 used game on ebay, I know which option I am taking!