a lot of the top writing sites tend to get substantially more traffic from women.

Sorry to say but I don't think making generalizations based on the genders of the clients you've had is rational because you've also stated that you don't know for sure the genders of everyone of them.
I am assuming that since you're in this business, you know the value (and risks of) data handling. It would put a question mark to your knowledge of the gender-related data with the top writing companies.
That said, I would not really favor anyone who is of the opinion that more females than males use essay writing services. A great majority of my clients have been (and still are) males though females are no exception.
This is also significant to understand that, though industrialized countries flaunt their human rights legislature so proudly, reality is still bitter. Take, for instance, U.S. where female population is still the most vulnerable group: poverty, psychological issues, and many relevant areas are still very grave for them.
I am not saying it. Googling a few relevant keywords would definitely take you to a number of reliable references. Workplace differences between genders, i.e. pay parity, working hours, etc. still remain a challenge for the ENTIRE world, and women are still at the receiving end.
In the developing world, the situation is even worse (So, don't think I am sparing my country, lol).
Thus, your generalizations kind of sadden me, and I wish we all could take a position that is grounded in a broader view of the reality of our world.