It's disgusting when adults take advantage of children.
Peter is a toy collector and has noticed that his neighbor's 8-year old son Ben has a rare toy.
Peter wants to buy the toy from Ben.
Peter offers to buy the toy from Ben for its full value.
Peter offers to trade a common toy from his collection to Ben for Ben's rare toy.
Peter acquires the toy he wants and doesn't compromise his integrity.
Ben's parents find out about the trade and are very angry at Peter.