> People who employ them often assume they’re fine because they haven’t been audited or caught yet, but that doesn’t make them legal.
There's also the pack effect. Kind of like how few folks taking the EITC actively trade stock, it looks 'normal' for rich people to do these things, whereas the same device when used by someone of more modest means is more likely to attract attention.
Not to mention having fewer resources to fight if you are audited.