I think the nature of the question is unclear.
My guest is Burrina was thinking of something along the lines of "feature request" for a software application. A place where people could vote on something they needed, raising a particular "Demo" to the top of the list. If that's what he meant then I can see that it is a good idea, however it does have several problems.
Many people have little idea of how to describe what they want.
There are always two or three different ways of doing something.
Who is going to create the demo?