Forgive me if this has been covered before...$40 for 10 images, with a subscription that can be rolled over if unused? So $4 per image. Was this the deal contributors complained about, so iS decided to give us our percentage royalty rather than a subscription royalty? I can't remember.
Also, at the bottom of the page it says buyers will lose the right to roll images over if they don't auto-renew their subscription. So iS keeps the $40/month whether people buy anything or not? In that scenario iS gets $40, we get nothing, buyer gets nothing.
http://www.istockphoto.com/plans-and-pricing