It isn't so much to give a pound to the person reporting it, but more to make those doing the shoplifting think that other people are probably watching and may well challenge them. At the end of the day, everyone should care about this. It isn't people stealing baby formula. It's people who this for a living, flogging what they've sold in pubs etc. This is a major issue on high streets. It is pushing up the cost of goods for all of us and it it putting small companies out of business.
Within a week of me opening a high street shop I was hit by a shoplifter. A middle aged man, well dressed. He came back a week and a half later to try again. A few weeks after that I was hit again, by a well presented chatty couple. He spent money, she did not pay for her goods 🤬