Sometimes it works out
I kept being sent some Shell club (snail mail) letters for someone I'd never heard of. This started several years after we moved in to our house, and the name didn't even match the people we bought it off. After sending a few back with 'not known at this address' I got bored and opened one to found they contained reward vouchers as this individual bought quite a bit of fuel. It wasn't much but nice to have, until Shell did a new loyalty scheme. Oh well.