Vending machines that buy things

Last night, I dreamed of a Japanese vending machine that did not sell things, but instead purchased toys and figurines from children, particularly the collectible sort.

It would be hard to do that for real, as the value of such toys depends on the exact model and its condition, obviously. But we’ve already got machines that ‘buy’ used soda cans and bottles for recycling. What else could a vending machine reasonably buy?