Prisons have a lower-than-general-population-iq for a reason.
The effect of getting caught is only half the story there; IQ is more generally correlated with all manner of "low time preference" type decision making.
There's plenty of high-time-preference crimes.
Not really. Almost definitionally (because of the way we've built society over time, not by semantics or chance) crimes are a "shortcut" compared to the honest alternative.
Maybe if you are considering crime committed in pursuit of profit, but unfortunately there can be many other aims.
I was thinking about this, how all the secret societies and crazy conspiracies we know about are just the ones that failed to keep the lid on.