Because istockphoto doesn't have anything resembling "news" photos. Whereas Flickr's got lots of photos with real people in them.
I've used istockphoto extensively. it's all models, references, icons etc.
If I need a decent picture of the Mayor of Chicago at a recent festival, there might be 10 on Flickr.
There won't be any on istockphoto.
Because istockphoto doesn't have anything resembling "news" photos. Whereas Flickr's got lots of photos with real people in them.
I've used istockphoto extensively. it's all models, references, icons etc.
If I need a decent picture of the Mayor of Chicago at a recent festival, there might be 10 on Flickr.
There won't be any on istockphoto.