@brodehouse: The idea that a game sells better among demographics which are well represented in that game is implicit in the statement "the reason [developers make] white male protagonists instead of female protagonists is because that white males are the highest demographic". Namely, why would you think developers do this if it had no effect on who buys your game?
That's two strikes.
Read again. He said that the reason that most protagonists are men is because the market is mostly men, which you restated. This is not the point that I disagreed with. You then added, on your own volition, that the reason the market skews male is because there have been more male protagonists. This is not arguing that market trends dictate the sex of the protagonists, this is arguing that market trends are dictated by the sex of protagonists. It is not so.