A law firm pursuing patent claims has to leave a paper trail. The more convoluted, the more likely jurors will be inclined to see fraud.
As the system exists, if I were to make, say, an incorrect bill or make some other factually incorrect assertion that you owe me money, it is assumed to not be a crime or even a civil offense. You would have to prove it.
The advantage of RICO is that it makes the pattern of behavior and therefore all my legal records a matter of possible interest to the judge. There is still a lot of work for you to do, and I can try to hide behind client-attorney privilege.