If a person is that financially rich but still has to live like a grad student, it seems like the only point of that wealth is to rebel against the legal system. Even if one isn't caught, there's still a loss of freedom to avoid getting caught.
I haven't studied criminology, but I alternatively suppose someone who does that just doesn't think that far ahead. This likely also explains why the vast majority of people with these capabilities choose to live a life in accordance to their country's laws.
There's money laundering; have a front business and gradually mix in a bit of the illegal money and pretend it came from the business. That's how mobsters do it.
That's right; your comment brings to mind this scene where the character Saul Goodman explains money laundering in Breaking Bad (this clip is supposedly shown as part of university lectures): https://www.youtube.com/watch?v=RhsUHDJ0BFM
I haven't studied criminology, but I alternatively suppose someone who does that just doesn't think that far ahead. This likely also explains why the vast majority of people with these capabilities choose to live a life in accordance to their country's laws.