Are these tags connected to a network? In that case I can definitely see the appeal for chain stores where you need consistent prices across stores in multiple cities. Set the price centrally, and have it come through everywhere without the need for any employees to go around setting new tags. Given all stores are chains these days (sadly) I can definitely imagine those savings add up to offset the cost of the tags. Especially over time and considering how massive some stores are.
Yeah, they're normally hooked up to a low bandwidth network like an IR mesh or something.
Another benefit of that is that it leaves the only regular stocking left which is the easiest part to automate. At that point you can cut out the grocery department entirely and leave the 10% weird cases to the front end staff.
