I'm sure you're right, but the reason I know about them is that I do know a guy who used one, and got a "better" prison. No names, for obvious reasons.
Not only was the advice I received unhelpful, following it actually made my stay longer. My family would have been better off taking the substantial amount of money and setting it on fire.
I have a feeling she will not do as well inside as Martha Stewart did. Too much ego.