Up to the 1980's way more women tended to be at home when JW'S came calling then men. Home had 2.5 children who needed their momma's attention. JW's came to them, visited them in their home's and gave them a bit of the old love bomb. So they would predominantly be the ones that were introduced to the cult. The husbands might go along or at the least sign off on the religion as women's work. The mothers usually had the most influence with their young children and the father's less so. So before you know it the hooks went in......deep. That generation of children would in turn marry witnesses' and the next generation and the next would as well. Eventually the blood line and commitment weakens since it was only about how you were raised. Since the commitment was not voluntary push back starts up as it does in most dominant type religions.
Because the WTBTS is male dominated the males, as others have commented on, are more often exposed to how the sausage is really made, so to speak, and it's often not a pretty sight. The connective tissue is thin to start with and breaks down frequently. Throw in a lack of education and often menial jobs plus a huge time sacrifice and the total involvement needed if one wants to climb the ladder and you have what is happening to many on this site......... the breakdown of a belief system that can't measure up.
Women are also fighting back more and more because many want an education and want to date to be sure of a potential mate. Why does it seem that there is less coming from the women may simply be because they are still the primary care givers and a healthy proportion don't work outside of the family. They are also spared the sausage making since they can't have positions in the congregation. If they are comfortable in that situation then they are not going to be greatly troubled by doubts until an event triggers it. With more education and working jobs away from home many more sisters ARE experiencing doubts and asking questions.
But this is a tough system to buck. By way of example:
In my small city we have a military school. The top people live on campus and there are name signs near the front door that say General and Mrs. Robert Brown. Colonel and Mrs. Vincent Cob and so on. And so it is with JW's.
Without it's women the JW's would fold. By not respecting their women they are half as effective as they could be.