Agree, just because you are using an asset (the travelling space) and charging two different prices for it, doesn't mean one is getting it cheap.

When bookstores started putting coffee shops in them, the coffee shop only took a small portion of the bookstores footprint. Though the revenue per square foot was larger for the coffee shop, they don't just say 'we should charge more per book because of the revenue difference to the rev/sqft in the coffee shop.

Seriously flawed logic.