Why do you need the state to recognize your commitment? You don't.
You do it for no other reason than to qualify for government cash and prizes.
Well, I can only speak for myself, but I did it for two reasons. First, it is traditional that committed couples get married, and there is something to be said for honouring traditions that have nothing to do with religion. Second, I did it to clarify health, and custody issues. Should my wife become grievously ill, or suffer an accident, i would like to have the
legal authority to make decisions about her care, so that I will know her wishes are being met, and, if she passes, I would like to have some legal standing to try to insure that my step-son has an alternative to being shipped off to a "father" he has not seen in 5 years, has not spoken to in 4, and wants nothing to do with.
Now, you can call that "government prizes" if you like. I call it ensuring that I can care for the family I love.