The point of a sci-fi con is to be among those guys, to say, "Me too," to realize, "These are my guys." Weeping is optional.

It is easy to joke, but the point is that a science fiction convention is a wonderful place to learn new things, meet interesting people and in general get the most out of an exciting and rewarding hobby. It gives fans a chance to share their passions and interests and creativity in a safe social space where they can be applauded rather than ridiculed. In general, it's just a wonderful way to spend a day.