Shutterstock is picking up nicely. Revostock and Pond5 earn twice as much + (each) than Istock each month and Stockxpert (which I had fewer downloads on) financially beat Istock also because they pay so well. If your exclusive, I'm sure your doing better on IStock than I am, but I would never go exclusive because Revostock, Pond5, and shutterstock make so much more money. Even if IStock paid exclusivity at 50% (as opposed to the 20% I get now on Istock) it would only cover 1/2 of one of the other sites monthly earning.