I am a third generation JW. The biggest difference for me and my family is that we are broke-ass poor. My parents and grandparents (immigrants) thought the end was coming and never accumulated money. The non-witness part of my family all have good education, great jobs, nice houses. And they aren't the brightest bulbs on the lamp. There never was money for down payment for a house - the one investment that most people have. Now my parents are dead and they left nothing to their kids. My contemporaries who became JW's on their own have all inherited money from their parents. None of them are millionaires but they got 200-500 thousand bonus from their parent's death.
The biggest difference is that serious JW's don't accumulate wealth. For the average family this needs to be done over a couple generations. I have known JW's who didn't take the religion serious who got their coins.
Add to that the problems with leaving. You need your families for help. (Usually baby-sitting and transportation emergencies.) You have no friends outside. No network. Bad health because self-employment (carpet laying, window washing, janitorial work) puts you out of range of good insurance.
My Grandparents came from Eastern Europe to live the good life. Then they became JW's oooooops. That's it for a couple of generations.