That's incredibly shitty. Having worked retail though, it seems a fairly natural and logical progression of the upselling and extras targets given to staff.
When I was working for Iceland (frozen food shop) they replaced the cards for the Home Delivery scheme with overall loyalty cards and demanded that we get every customer, not just HD customers, using them. We were given "swipe rates" of 35% to hit (and that was set to increase as the scheme went on), with the implication being that there would be disciplinary action if you repeatedly fell under that. Trouble is, the benefits of the cards were so vague and intangible that no-one was interested, so cashiers ended up keeping a dummy card with them at the till to swipe through just to keep their swipe rates up. It was a complete nonsense, but one that the head office seemed desperately keen on (they seemed to have dropped it now, as whenever I go in to buy stuff, I'm rarely asked for a card).