I don't understand these levels. Doesn't it seem backwards? I mean the more it's downloaded I would think it would become cheaper not more expensive. I would think it would be more valuable as a novel image rather than an oft seen one.
I think DT beleives that the number of downloads for an image directly reflects its popularity. In the business sense, the more popular your image is, the higher the potential value it has. I think DT designed it that way so that the value of our images do not deteriorate by getting cheaper everytime they're downloaded but instead increases to signify that the're popular and thus have a high demand.