Hello,
I have been programming for about 10 years. I am fluent in PHP and SQL databases. I have done similar things to this before, only not for a wordpress plugin. I have made a few wordpress plugins for my personal needs though. I have done a similar task, with a marketing system I created for my business partner. He wanted a click rotator where people's affiliate links were in a pool, and rotated throughout the system.
I can easily create this script/system for you. Please note, that due to the large coding project, I request 1/2 up front, and the other 1/2 upon completion. I am fully confident that with my 10 years of coding, I can complete this project for you. Thank You!