Well, in a way they are implementing their "evolutionary system". I quote you:

"Mr I-Need-The-Highest-Value-Woman-So-I-Will-Keep-Searching-Forever. His genes are gonna die with him, and good riddance."

So by acting like this, their genes are going to die and, more importantly, since they won't parent many children, their ideas won't be passed over.

I'm joking, you are completely right on your take on "evolutionary psychology". XD