You are not reading my comment. I am not alleging a "scam" I am alleging an illusion, encouraging people to buy more because they (mistakenly) believe they will get a discount for buying in bulk

"2 for $8" is a lot catchier than "2 for $7.98" and I understand why it got simplified and such. Likewise, I'd bet your "YOU SAVE -10 CENTS" example is from a $0.99 product being advertised as "10 for $10". That isn't what I'm talking about, though it is kind of embarrassing for any POS software provider in 2022 to not be able to identify and flag a "negative discount." But I don't believe it is an "accident". It is an intentional attempt to get people to buy more of a product than they would have otherwise because they believe they are getting a "good deal" even though they are actually just paying normal price. It is a similar illusion to stores that mark everything up to ridiculous prices just so they can make customers feel good about buying that item that is marked "40% off."