Posted By kelvinjay:
I get it all the time and it is odd. A photo that hasn't sold at all for months will often be downloaded twice in the same day, often within a couple of hours of each other. The really weird bit is that it's frequently the same size - so not a question of someone buying the XS and then the L versions or whatever.
So far my theories to explain it run like this: there's a big company somewhere that gives briefs to a couple of design agencies, which both use iStock and decide that this image is the one for them. Or, maybe a large agency has more than one designer hunting for stuff and buying duplicates - either way Thank you very much!

I just can confirm, have a couple of pictures with no activities for 6month, suddenly 3-4 downloads during 2 days. I guess both theories are working, 1. people buy small format first and download the large later, or there is a brief from agency to many designers for the same topic. What about shcool and universities? The teacher may ask the class group to prepare design for a given topic...
Miloslav