It is registered in almost all systems already and you'll get the discounts. They get nothing (except the knowledge that apparently Jenny buys everything). Plus, nowadays most people working at checkout don't even know the significance of that number and don't bat an eye when you give it
But then, some won't notice if you say your number is 314 1592...
that's only a problem if the minimum wage worker behind the counter cares, which I doubt.
Plus those cards often have points or other rewards, e.g. spend 2400 points and get these cucumbers for $1 off, so it's a win for them too.
The cashier doesn't. Their incentive is to keep the checkout line moving. Sometimes they will even offer you a card at the register to get you a discount (not sure why).
The manager's incentive is to keep customers content and returning.
BTW, what is the significance of that specific phone number?
Because they are told to do so, to get as many customers as possible use the card. My wife automatically answers "no, we haven't got any and are not interested, thanks".
> BTW, what is the significance of that specific phone number?
It's Pi :)
Cashier card is something I don't understand either. Maybe some database somewhere with NOT NULL, so that problem was solved by issuing cashier cards?
https://www.youtube.com/watch?v=6WTdTwcmxyo
On a side note, the phone system has a reserved number range (555-XXXX) for fictitious numbers for TV/movies/etc. to use. This song didn't use that but instead used a real number. When the song came out in 1981, people who had this number got so many phone calls they had to change their number. I'm not sure, but phone companies may have retired the number because it has become impractical to use.