I think that there is a demand for C# tutorials.
I don't think it is fair saying "there are plenty other tutorials out there, so why bother", because there are plenty of C++ and C tutorials out there - This site does them well, so competition isn't really a problem.
The most likely reason (in my opinion) that the C# community on here is quiet is because of the lack of support in the form of tutorials.
However, does cprogramming want to diversify to include C# tutorials? There is a forum thread for C#, and that's about it. What about Objective-c? Maybe there is an advantage being a specialist in C and C++ over being the tutorial site for all C languages.
I'm waiting for the Java tutorials (which have been on the LHS of the main cprogramming site for a while)
The hash and the sharp symbol are two different characters.
The language is indeed called "C sharp" but due to the restricted character sets of standard fonts is often written with the hash symbol.