This reminds me of an experiment where they had a babysitting company fine parents for being late to pick up their kids. The reaction was that parents would be

This reminds me of an experiment where they had a babysitting company fine parents for being late to pick up their kids. The reaction was that parents would be late more often, because they felt they'd "paid" the price. It's not quite the same but there is an overarching theme around the idea that once we think of something as a monetary transaction, we behave differently.