I read someplace awhile back that several of the lottery winners stay in touch, and have their own networking scheme to assist each other. I'd imagine they would know and understand the problems of sudden jackpot wealth better than most.
It's also wise for them to remain underground to some extent. One big winner said that people assume all lottery winners are more accessible than regular rich people, and are easier to reach and bother. He said that, at first, especially where he lived (in a regular middle class area) his family was just overwhelmed with money seekers, some of them not very nice. They decided to move, far away, and stay connected only with close friends or family.
That same winner also said he had to use security at times to protect his family.
It seems that most winners, althought changed a bit, live rather normal lives and stay out of trouble. Some don't. There are no tests required to play, so, hence, any legal adult with a buck can win. Given that, and that fact that winning itself can bring on many problems, its amazing so few end up like Big Jack in WV.