@cbae: why bizzare? :) Many hedge funds use .NET technologies, having to switch constantly between R and Matlab and our own C# financial libraries get's cumbersome. Now we can load our data in a C# environment, explore it, run back-tests, and quickly deploy new ideas.
A big issue for us has always been the need to keep large amounts of data in memory, without constantly restarting the program. CShell allows us to do that.
Plus, CShell, is built on awesome opensource projects, like NRefactory, AvalonEdit, AvalonDock, Caliburn.Micro... why not give back?