The techniques you learn in a simulator will be of very little value in the real world. Its SO different in reality. The forces acting upon changes EVERYTHING.
Sims improve accuracy, mental capacity, and concetration but they don't help specific techniques form my own experience.
I am pretty sure they are not just modded rfactor models and what not.
Also check this out - http://www.grandprix.com/ft/ft20831.html - mentions how the McLaren simulator was used in the development of the new 09 regs if I am not mistaken.