I doubt your buddies support you the same way two people within a relationship support each other. Do they help keep a roof over your head, food on the table and stay out of debt?
I was mentioning friends as an answer to your point that humans are a social species.
For the roof over your head etc. part as I said in my previous answer it would be one of the cases where being in a relationship is useful. I even gave the example of someone playing the angle of a stay-at-home person.
But that said people find support where it's easier to get from. For some of us it'd be a partner for others our family or friends.