As a non-exclusive my sales at IS have dropped about 60% since October. I never really worried much about their bizarre approval criteria or the fact that you have to pay $20 to use their FTP program to upload files, but with this sharp decline in sales and the long, long, long approval times it doesn't make sense to spend much time uploading to IS. My sales at StockXpert and Fotolia have increased dramatically in the last 3 months (coincidence?).
I don't know what the guys from IS are trying to do, or if that's their strategy to get rid of the non-exclusive members. Only they know what their doing.