Women, as in other aspects of their life, tend to be more serious and mature. Maturity is not necessarily an asset in the creative field. Creativity is enhanced by the ability to be child-like, which men seem to relish. There is always a little boy inside every man, while the little girl in most women is overcome by the inequities of life. Women simply have to work harder, and take life more seriously to overcome years of discrimination.
Creativity suffers when the mind is imprisoned.
But thankfully, that too is changing People tend to achieve what they believe they can achieve. It is called confidence, and men are simply more confident as a gender than women. That is not to say all women lack confidence, or that all men have it. It is a question of numbers, and in pool male players overwhelmingly out number women. If it can be assumed that a given percentage of men from the total male pool will surface as top players, and the same percentage from among all women will also surface, the total number of top players will heavily favor men.