Well, one thing that can be said for the Star Trek world is that it can give hope that what we know in the here and now isn't where it will all end. Star Wars is in a galaxy FAR FAR away. Star Trek is in the HERE, just not now. It shows how it is possible for the problems of the twenty and twenty-first centuries to eventually become obsolete. So in essence, one big draw for Trek is the HOPE that humanity can grow and not just eliminate ourselves through war and intolerance.