I really need everyones expert advice. I have been going back and forth on dropping my exclusive to istock and was wondering if it is worth my time and effort. I have noticed a steady trend on lower returns. However, I am not sure if I could make up the difference by losing exclusive % and submitting to shutterstock and Dreamstime.

Is the lowering of returns just the reflection of the global economy or has istock lost its base?

Here is a little info:
http://www.istockphoto.com/xacto

I am currently an iStock exclusive contributor since 2005. I am have the Gold Contributor level with over 23532 downloads and 350 files. I have 30% royalties for photo and 25% for illustrations.

Trends:
2008 = $12,000
2009 = $9,500
2010 = $9,800
2011 = $6,700
2012 = $5,600

Any guidance would be much appreciated!

Thanks.