As I don't speak russian or know enough of their culture I also don't understand a lot of things, although I understand that M, D & S (and most of the other RLC workers, if not all) are very special people. Yes, they need money and a place where to stay and be feed. But they also like to be under the cameras. All of this to say that what is anormal for us, it is normal for them. Perhaps there is an agreement: Sasha takes care of Masha during the day and everyday. At night he takes care of Dasha. At the end is a win-win business but Sasha is the big winner. And if they get more money, perfect!