CellBioGuy isn't (so far as I can tell) trying to force employers to pay women the same as they pay men (that would count as "demanding" and might be unethical); he's merely saying that he thinks they should pay women the same as they pay men.
Not really. If an employer only hires women than it's not about paying woman as much as the employer pays men. There no real reason why the employer who only hires woman should pay them as much as a men would get if he worked for someone else.
If a men applies to the company and is willing to work for the kind of wage women usually get in the market place of course he could be hired.
LW readers have unusual views on many subjects. Efficient Market Hypothesis notwithstanding, many of these are probably alien to most people in finance. So it's plausible they might have implications that are not yet fully integrated into current asset prices. And if you rightfully believe something that most people do not believe, you should be able to make money off that.
Here's an example for a different group. Feminists believe that women are paid less than men for no good economic reason. If this is the case, feminists should invest in companies that hire many women, and short those which hire few women, to take advantage of the cheaper labour costs. And I can think of examples for groups like Socialists, Neoreactionaries, etc. - cases where their positive beliefs have strong implications for economic predictions. But I struggle to think of such ones for LessWrong, which is why I am asking you. Can you think of any unusual LW-type beliefs that have strong economic implications (say over the next 1-3 years)?
Wei Dai has previously commented on a similar phenomena, but I'm interested in a wider class of phenomena.