Millions of dollars. More than they can make anywhere else.
These are supposed to be intelligent people, yet they seem to not realize that there are also intelligent people on the investigation/prosecution side, and/or that events (e.g., crash from organic causes or competitors' interference) can make obvious their crimes?
Maybe not so intelligent, and certainly not ethical.
But for people who have a good socio-economic background, great education, and ability to make an honest living, it is not only foolish, but reprehensible to decide instead to harm others for a living. Disgusting.
You see billionaires' unbounded greed all the time, for example:
https://www.wired.com/story/koch-brothers-are-cities-new-obs...