Just so that I do not come out as entirely for this incentive based system, there is one major problem with it.
It makes it impractical for small local agents to set up shop and make any money on ticket sales since they will be unable to make/satisfy the type of agreements that large agencies do unless they get into a franchise situation.
Too bad because that would have been the best hope for personalized service. But if customers would rather deal with the impersonal web pages and customer service calls to Mexico than pay $10 extra for a ticket, perhaps there is no market for it?