I get the feeling that going "exclusive" at iStock is purely a personal choice. For me, when the option comes available I'm sure I will just have to compare the numbers, try to project my income in either scenario, and make the call based on that.

Are you an exclusive iStock contributor? What made you do it? If you're not and have the option, why aren't you taking it? I'm curious to hear some stories of why you did or didn't take the exclusive deal, as I believe some people may have different reasons behind their decision and it's not always just about earnings potential.