Virgin Galactic has proven its space tourism model. Now, it is laser focused on building a profitable business.It's pretty hard to argue Virgin Galactic (SPCE -6.23%) is anything but a story stock right now. And you either believe that story or you don't. But there are some pretty compelling elements in the narrative, as well as some really big problems.Are you a glass-half-full investor or a glass-half-empty investor? Here's what you need to think about as you make the buy, sell, or hold decision on Virgin ...