My 2 cents worth.
Secondly, if there are kids involved, one can't just think of oneself. In our situation, my wife takes my kids to meetings and field service. I actually don't know to what extent they believe the crap. However, there is no way I am going to abandon them to a shyster organisation that discourages higher education and actually wants to ruin their future.
Thirdly, for some, the financial aspects of walking out are potentially devastating.
I have thought a lot about whether it is disloyal to contribute to these bloggs. On one level, yes. However, my wife is being controlled by a parasitic organisation that, by design, contributes absolutely nothing of worth to society or humankind. It is the parasitic organisation I am up against, not my wife.
I am here mostly to learn about WTBT$ (something I should have done long ago) so I know what I am up against and how to fight it. I also to do my tiny little bit to oppose that organisation. I also ultimately want to leave the world a better place than how I found it. The world would be a better place if there is no Watchtower using Jehovah's name to suck up all the time and energy of so many good people on pointless marketing to fellow Christians.
I should also add that my wife actually knows I have occasionally read apostate websites. (She is upset that I have. She says they are full of bitter people with "agendas", are controlled by Satan, and that I should read jw.org to understand the organisation.)
In summary, I consider I am fighting WTBT$, not my wife, and my conscience is clear.