Note: Rand doesn't care how productive someone is, only that he/she attempts to actually be productive. Obviously there is great variation in how productive (in an absolute and economic sense) that individual humans can be. The point is that some people strive to produce while some strive to take power over others.
Right, but there are also many who are simply discouraged from striving at all, possibly jaded. Rand never considers the forces behind this fact: she simply casts them as villains.