The WordLadies do many interesting composting projects. You should check them out. http://www.wormladies.com/
Students at the Randolph Community Middle School and Point Webster Middle School mass ( weigh ) the worms as a part of a Bottle Biology composting project. Red Wigglers in ideal conditions digest 50% of their body mass daily. Worm casting can sell for as much as $ 120.00 for a 5 gallon bucket.
The most important factor for most of us is that vegetables grow very healthy and harvests are large when growing in this medium.