My favourite analogy for getting people to do things is the folktale concerning stone soup, which works on the theory that people will not volunteer, but don't mind joining in, and the more of them that join, the more enthusiastically others join them.
In general it works with people in voluntary groups, although there is a related effect which I call Playground. This happens when a group gets a bit too big and popular, and some people feel they are not getting enough attention, so hive off and form their own group, around their own soup pot. This happens all the time in the world of Amateur Dramatics, where the proliferation of small groups is dizzying. Our own group, spawned amusingly from a group called Breakaway, has this year spawned two more. Each one creates more obligatory evenings at not very good plays, followed by the statutory half hour in the bar kissing everyone and telling them they wonderful. Sometimes they are.
Soup is very much one my mind at the moment, as my Lenten lunch consists of whatever soup is on offer in the cafeteria, no matter how noxious, and a piece of bread, no matter how sponge-like.
The idea behind this is to experience the removal of choice. The poor do not have any choice over what they eat. They eat whatever they can find.