FAA makes their money on the production side. The framing, matting, canvas, etc. etc.
After you load a few images and put you price in, you will see it. If you want $50 for a 24x36 for instance, they will sell it at a mark up form that price and then make money even on the paper they print it on.
You will get $50 plus 5% of what ever the framing the customer buys. You don't have any costs. You net $50 no matter if they frame it, buy it on canvas, a metal plate. You get the same $50 plus that small commission on the materials sold.