I have no idea, but the American Mafia does have some pretty wealthy members. Salvatore Avellino, two guys from the Colombo Family I can't even mention because their names will be blocked out, even the newest made man rat Richard Ferrara from the Colombos is said to be pretty wealthy. Lots of guys do have lots of money, despite the current shape LCN is in. They're just going to have to come up with new rackets to fit this day and age if they're going to stay in the business of crime. Many of your wealthy mobsters have very successful legitimate businesses.