Someone just asked me about staging their home. They wondered if they should put their house on the market and see what happens. Then, if it doesn't sell, they might consider staging it. Of course, my recommendation is to stage first because the cost of staging is almost always much cheaper than the first price reduction a seller may have to make.
I just read an article about Staging Myths on Ezinearticles which addesses the question and a couple of others, so I thought I would pass it along: