I would say that most of the soldiers, and perhaps even the captains like Paulie, lived a life similar to Henry Hill in "Goodfellas." Look at all the cash he came into in that movie and he had nothing but the $3,300 Paulie gave him at the end.
The point is that most of these guys spent the money faster than they earned it. Maybe Silvio, Tony, & a few other guys "saved for a rainy day." But let's face it, none of these guys were terribly bright. Most of them made the money and had big expenses and/or flaunted their superficial wealth.
Tony, as boss, had a nice cash stream flowing in. But it was very evident during a few points in the series when he felt the pinch in his cashflow.