A divorce lawyer I know said that much of her business now comes from Russians who married for a green card and are subsequently divorcing. A recent New York Times article pointed out that health benefits have become an increasingly common reason to marry as well. Many couples are now tying the knot -- or accelerating their courtships -- because one party has health problems and the other has insurance.
Health benefits are also a reason people are staying in their marriages. I know a couple who have been separated for some time. The husband, a self-employed writer, asked his imminently-ex wife to hold off on the divorce so he could continue to enjoy the health coverage she gets through her job. She kindly obliged. And I've dated men who prolonged the litigation process in their divorces just to hang on to their wife's benefits!