@Anonymous wrote:I think in most cases, someone would net more savings shopping for groceries at Walmart with NO cash back at all rather than at a supermarket with 6% CB from a BCP, simply because Walmart's prices are that much better. That doesn't take into account things like couponing that one can have success with at certain supermarkets, but it's a both worth making regardless.
Paying 10%-20% more on groceries just to get 6% back for example still results in a net loss of 4%-14% over shopping at the cheaper place.
That's going to depend on not just the supermarket, though (and reminder that groceries != supermarket), but also the area they're located. In my area, most of the grocery stores are not much higher (if at all) than walmart. I shop Lidl and I pay way less for a lot of stuff than people do at walmart (I can't speak to the discount grocery markets here, as I've not been). And we get the bonus of the supermarket category.
So YES, absolutely, you shouldn't just change your shopping habits for a CB card, especially if it doesn't make financial sense, but if you can get good rewards without changing habits, do eeet. But there are so many factors, it's no wonder this game is confusing for everyone.
Personal preferences will always play a roll as well. I'll have 30 credit cards to squeeze out every last percentage, install honey, rakuten, and every online money saver available, but good luck getting me to clip a coupon 
(also, I would like to thank the stars that I can buy wine in grocery stores... I won't say I get a lot of rewards from there, I'm just saying it might happen).
I agree with @calyx. None of the Walmarts around us are Neighborhood Walmarts, and there is only one Super Walmart, which doesn't have much in the way of groceries,and the produce leaves much to be desired. Each person has to decide what works best for them.
