It's not even in the best interest of the country! The land does much better when we're not covering it in houses. But you of course refer to the military state. I think anything the military state ought to do is something we ought not to do, personally. Marriage just encourages them.
Also I'm not gay, so it'd be a marriage of convenience, which is illegal. Even if me and a friend could get away with that, it's still unethical. It's like me and a friend getting away with robbing some old granny of her purse as she's crossing the street. Yes we'd benefit from doing that, but!