007, lots of people attend churches where they don't believe the doctrine. They just keep their mouths shut and go for the fellowship, the choir, the youth program, church picnics, etc. Now granted, the JWs don't really have any of those things except for a certain amount of fellowshipping, but to your wife that's worth it. And maybe for you that's worth it too.
I was talking to a friend who happens to be agnostic-leaning-atheistic. She has attended the First Baptist for YEARS because she loves the choir. I have a client who attends the Unitarian with many of her friends, even though she is Catholic.
I know we have this huge indoctrination to overcome that if you attend JW services, you are unequivocally a believer and supporter. But I have to believe that a fair percentage of "Witnesses" are just going to church. I've learned from talking to church-attending non-believers, that the church leaders will still try to get people involved more actively. It's the same all over, the JWs just think they are different.
Millions of women get up in the morning, take their B.C. pill, then go to Catholic Mass. Why should the JWs be any different. What will truly break down their policies is if tens of thousands of attenders just quietly do not comply with their rules on shunning, transfusions, entertainment, college, and so on. I'm sure there are plenty of Mormons out there who don't wear the special undies, too.
When I was newly out of the JWs, I couldn't wrap my mind around anyone just silently attending, or going back because of family. But the more distance I put between myself and the JWs, the more I see that it's just another religion.