In a way it is cost - I could publish the image on here, but I paid for it.Correct. Happens more often than one thinks, but if I ever breach their confidence, the supply dries up, obviously.
edit: ACuriousPLAFan (I suck at multiquotes and edits) - this image is authentic. Heavily edited as you say, but it matches one of the pictures I saw.
The last time I did that, the image ended up splashed all over the Internet, my watermarks removed or blurred out, claims the image was paid for by others and suchlike.
In other words - no credit, no money.
