That's kinda my point though: what extra labour? It was to be calculated at the till anyway, no? And it takes exactly as much labour to price each item, regardless of whether the price is with or without tax. I mean it's not like they expect the customers to calculate it for them and take their word for it.It's a matter of is the extra labor worth it to the retailer.
Bleh. I don't think there's any logical way this will make sense to be besides "hope people are too lazy to figure it out in their hands and spend more than they really intended because fuck it, who has time to math!?"