Billing supermarkets

More and more grocery stores have introduced customer scanners. I would happily use one, if they paid me to do their job. I thought of how to send them a bill.

Figuring my time as 100 CHF an hour, if I spend 30 minutes a month scanning my grocery purchases, then the bill would be 50 CHF.

People who earn less would be paid less. Housewives, who do not work, might be paid at their husband's hourly rate. 

In Switzerland there are some extremely high salaries, some going into seven figures. Naturally they would earn the most for the time they were working for the supermarket. 

For people with lower salaries, they could add to their income perhaps without having to get a second job to make ends meet.

Just an idea.