No, the concept is that the 'sender' has to send less because the receiver takes some of the load. What ends up happening (for content with enough viewers) is t

No, the concept is that the 'sender' has to send less because the receiver takes some of the load. What ends up happening (for content with enough viewers) is that, on average, you transmit as much data as you receive, so the cost returns to being split evenly. Only now the actual usage is split evenly.