Yes it does matter.
Or maybe I am unusual in not wanting to be lied to by retailers.
British supermarkets have long been specialists at this sort of thing but are sometimes so clever they catch themselves out by leaving both prices in place. A couple of times I have even had to call the manager and insist that they remove said products with lying label. Taking the P. I now largely avoid the big supermarkets with their fake offers.
I think you’ve every right to wish retailers didn’t “lie” to you. I say “lie” because it isn’t really a lie but is misleading.
When I shop in supermarkets I’m careful to check the unit price - cost per kilo/litre etc - as this is the only way to get a true comparison. Of course there are plenty of ways round this for the supermarket. Yesterday in Aldi peppers were on sale for 41p each, 3 in a pack for 97p, family pack of 6 for £1.29. I chose the later as for me this represented the best value at 21.5p each. It sounds sad but it’s necessary if one wants to buy keenly.
Although I occasionally shop in Tesco I try to avoid it as much as possible. I don’t like Tesco’s attitude to customers and believe them the worst for misleading price displays.
Personally I watch sales, special offers etc. with a wary eye and only buy when the offer represents what I consider real value for money, I’m not interested in the discount. For years I’ve wanted a pair of high quality cycling glasses but I’m not prepared to pay more than £30. Maybe my expectation is unrealistic but the figure is all I’ll pay. On Black Friday I noticed a pair which met all my criteria marked down to £34.99 from £129.99. I’ve no idea if the £129.99 was genuine but I was happy with the offer so ordered them.
My perception of value for money is the only criteria I use when making my buying decision.