For people who aren't comfortable asking for a discount, I can see where a card like that might give them the chance to do so.
I don't know how much they are asking to purchase one of those cards, but here in the US there is a similar "card" called the Entertainment Book. It's like $50 or so and gives discounts on the local area. Schools often use them as fund raisers. However, when I worked in the hotel business, the Entertainment Book would consistently advertise a discount at our hotel that we didn't offer. We would sometimes accept it anyway if occupancy was really low, but it irritated us to no end.
Not saying that the Hot card is anything like that, but I am always very skeptical of such offers.
_________________________
Now back to your regularly scheduled drivel...