I opted out as well.
On the one hand 123RF does not seem to have a contributor-friendly approach. I don't understand the rationale behind the hair-brained graduated royalty scheme - because its not the contributor but the agency that's responsible for generating sales! Their search functionality has a major impact on what sells, to my understanding. So DIS-incentivising contributors for lower sales is unacceptable.
Secondly, after the DP- Shotshop experience I did very much want to regain control of my work as much as possible. I therefore opted out of API/ partner/ reseller sales from 123RF and some other agencies.