Is this the idea where you pay more than you need to then they give you some of it back?
Mind you, when I look at my Nectar card my initial reaction is that the sum built up is OK, until I work out what I must have spent to earn it!
Certainly when I worked for a bank, many years ago, the salary was about as low as it could be then. A quick online check suggests that not much has changed.
Back in th 1990's we invited a Northern colleague and his wife and kids to come and stay with us for a few days. We're still great friends today and long may it last.
But, the first time they came we cooked dinner for them and while we were cooking, chatting & drinking they all disappeared...