The "famous salsa hell dance graph" has been around for 10 years or so. You can see it here: http://www.addicted2salsa.com/dance/the-famous-salsa-hell-dance-graph

This graph is basically the partner dancing equivalent of the SMV graph at The Rational Male. It shows that among beginning dancers, women are of much higher value than men. Girls just step onto the floor and it all magically happens, while beginning guys are useless.

A beginning girl will always want to dance with an advanced man, because they are at the same level. His task of leading is simply more difficult. An experienced lead can wink a shy girl onto the floor who has never danced before and make her shine. An experienced girl cannot do any such thing with a bumbling new guy.

Of course women in dance classes are reluctant to admit that the man has to do most of the work, because they would like to get their equal recognition. (Edit: and because of solipsism. Women simply assume that since they found it easy and fun, it's going to be easy and fun for a starting guy.) Nothing we haven't seen before in dating. Another major point is that you can only learn to be a good lead with the advice of a man who himself knows his shit. Sounds familiar?

The important message from this graph for us is what happens at the right end. There we see that the few men who never give up, eventually reach a value that no female dancer could ever hope to match. All the girls have an easy fun time at the beginning, basically getting a free ride, but in the end they lose out to the men who kept investing in themselves. All the girls will want to dance with that guy, and are like putty in his hands. Now he gets to be the critical one who chooses or doesn't choose whoever he wants.

As you can see this naturally leads to a kind of dynamic where all girls are kind-of-average, while among the men there is a much greater distinction in skill. Guaranteed but capped success for the women, a risky challenge with potentially great rewards for the men. Sounds familiar?

tl;dr Look at the graph. Salsa dancers have learned from practice that the role of being the lead is hard, but extremely rewarding if you persevere.