Heh, I'd say having more freedom is definitely a benefit of being alone.
For example, if you're married obviously you don't have the freedom to pursue people of the opposite sex who interest you anymore. That's kind of a big mistake, obviously. A lot of people find themselves unable to cope with this fact and eventually cheat, ruining their marriage.
Even trying to make friends with the other sex is harder, though. Your spouse might get jealous, or not like the person, or think they are hitting on you, or etc. What are you going to do in that position? Continue seeing your friend and ruin your marriage, or stop seeing the person and make them happy? (It's a bad situation to be in, but it still happens a lot just because you never really know...)
Or hey, maybe all of a sudden you want a motorcycle. If you're married you have to convince your spouse to let you buy one, and that's just not in the cards for a lot of people.
Likewise, if you have kids, what if you decide you want to move halfway across the world one day? You aren't just going to have to convince your spouse, you're going to have to pick up your kids from a stable environment that they've always known and change that drastically. It will have a huge effect on them. You have to think about that.
Being alone gives you a lot of freedom that you don't have otherwise. Every type of relationship you can have is, in a way, limiting your freedom.
For example, even if you don't have a 'significant other', it's still very hard to leave behind parents, siblings, or lots of friends if you went somewhere, even for a little while. It limits you.
I disagree it means that you have nothing left to lose, though. Everyone has something to lose, they just might not realize it until it's too late.
This type of 'Freedom' is more about not having to worry about other people when you do things.
As they say, 'the grass is always greener'.