Probably because airliners.net only give you a small percentage of the money. You can contact Photographers directly, I'm sure they will be more than willing to sell there photos. I'd made an amazing 40 cents on two photos thanks to airliners.net. As soon as I took them off the site I sold a picture for £25 with-in a week. Obviously not alot but beats airliners.net ripping the photographers off.