We found that long-term consequences didn't work if they were "manufactured"... i.e. taking something away. Break something, and you don't have it... but it wasn't something the parent "did", Know what I mean?? But "taking away"... their whole sense of time, and cause-and-effect, isn't the same as a NT kid. Losing X for a week, for example... by tomorrow, they have lost the connection between what they did and what is happening now.
Hanging onto and managing his money... is not the same as taking it away. He still "has" it, just not under his direct control.