A local group has been doing that for years and sending the cards to random members on an irregular schedule.
That's a good idea -- anything to corrupt this data.
Also, you can render the card useless, and then give it to the employee. They cannot scan it, and cannot read the numbers, so the card does not work. They will then give you another one. If they prompt you for your phone number, you can lie and say that you didn't have one when you were given the card.
"Oh, here is another one." The next visit -- opps, it does not work (again)!!!
Hahahaha!
I am fortunate to have some "Mom and Pop" stores around that I can buy food at, still, and I only purchase food there.
In the future of course, we will have to all be given an embedded rfid chip under our skin. This will, of course, keep us all very safe from the terrorists.
No?
Wait until another "terrorist attack" happens. One well placed nuke, and you will have the people BEGGING the government to protect them from the mean terrorists. Then, the national id will be a chip embedded into the body, so it will be very safe.
Retail establishments can then use this as their "loyalty card". However, your health insurance company may access the db and see if you are eating any King Dongs. If so, they may have to increase your health insurance bill. But that is okay, it is for our own good.
Also, perhaps cash can be done away with, and all transactions will be electronic. Then more information can be mined.
If anyone is interested in learning more, you may wish to look at this site here:
http://www.nocards.org/
But then again, I may be paranoid.
Just remember this -- the government, and the big corporate entities are certainly not your friends. They do NOT have our best interests at heart. That is for sure!