I think that out of the pool of images with about one to four downloads that qualify for the lower ranks of "best-sellers" on a specific day, the images that appear in that category are chosen at random. Also, you have to take into account that the best-sellers are counted seperately for each national site. So if one of your images sold four times on one day - say once in the US, three times in Turkey, and once in Italy - you might find it in the "best-seller" section on Fotolia Turkey but probably not on Fotolia US.
Ahh, didn't know that. Thanks for the info.
Maybe dld/views?
Probably something like that also. I think that if an image gets a download immediately after it is accepted it can get into that list.