Hawker,
Good points well made, I'll answer your points in order.
1. That's the risk of not paying enough, it's using this point that you can promote leakage from the empty leg market to full price charters. I can assure you there is not a broker in the land who would make me fly a full charter at a one way leg price, you pay your money......
2. You are right, and if we get a good double bubble we have and do share it with our principal client (as long as we have made a healthy saving).
3. The sale of empty legs is a different client base with some leakage after the cheap seats have got used to it and don't want to fly orange again. And if it adds £1000 to the cost we will sell it at £2500 or more.