I think this the understanding that we can gain in our community .
Mostly females like to have the company of the females and males remains in the company of the males . So the company plays a big role for the contribution in any things .
But still here in my community there are few girls who are using Bitcoin and cryptocurrency to make earnings .Beside these facts there is a big factor that girls needed only to educate himself to became a house wife ( in the most of the cases ) , so they don't want divert herself toward any new thing or any new ways where they can make earnings .
Since factors are more to discuss , but overall that is the understanding and need only that forces the people to make earnings .
And here in my opinion the % of the female bitcoiners is more then what the site gave .