FAQ / What are the 'levels' you describe? It seems that the more downloads you do the more you pay per image - which seems to contradict the packages you can buy, which say the more credits you buy, the cheaper each image becomes.

The levels refer to how many times an image has been downloaded by other users, NOT to how many downloads you make on the site. If an image becomes very popular, this system gives incentive to other images that are very good (but newer) to be downloaded, encouraging their use.