IDK what you’re talking about. They just have reward and non-reward pricing. Though, they do often have various sales going on so sometimes you have non-reward, reward, and sale price all on the same item. Not very often though.
The sale would be something like mix and match where if you buy five items that are part of the sale you get a dollar off each of them. Can be used to get some very good deals from time to time.
I frequent Kroger but it’s not my go-to store for groceries or meat. I’ve got plenty of Asian stores around me that usually have better prices. I’d say quality isn’t all that different between them either. Each rarely has bad produce but it does happen from time to time. Seems random.