The cause of the imbalance is women's Chad chasing. It is becoming more and more common for them to opt out of dating if they can't get the hawt guy they feel entitled to, but that's not limited to the bottom rungs. Even a 7/10 is going to have difficulty locking down the kind of gigachad they all want, and feminism has taught them that comprising even a tiny bit is a fate worse than death. They deal with it in different ways. Some opt out, some share gigachads in "situationships", and others financially exploit betas while fucking the guys they actually want on the side.