为什么ASP.Net MVC便携式领域不像Rails插件那样蓬勃发展？

I love the idea of the Portable Areas in MvcContrib. After reading up on it, and building a couple for practice, I was surprised not to find a plethora of open source projects leveraging this neat way to distribute features across MVC applications. I love the idea of the Portable Areas in MvcCon