This really isn't the sub for it, but I'm going to do it anyway since you spoke of her beliefs and not the writing.

What you describe as "capitalism" isnt. What you describe is economic exchange, and in this case the exchange of bartering. That decidedly is NOT Capitalism. Capitalism is a very specific form of economic exchange which includes commodification of labor and --for better or worse-- large systems of maneagable private ownership.

And re: selfishness you're addressing an issue that rand doesn't really deal much with. Sure, fine if I give to my starving neighbor that makes me feel good, and so isn't a purely selfless act. Big deal. The controversial take that rand has is that selfishness is, in and of itself, the highest good. Correlary to that: altruism is actually an evil. In other words, she goes beyond saying altruism is just another form of selfishness to saying: altruism exists and is a wrong. It's an asinine view of the world that doesn't take into account the most basic of biological facts, and is totally lacking in self consistency. Her entire make believe world falls apart when you start asking what the "self" is that is the beneficiary of this selfishness.