I’ll argue that you only need to eat five rich. The first two will be shocking, the next two will be surprising that they were eaten despite all the security measures, the fifth being eaten is the reminder that the rich will be eaten.
You’ve taken care of like, 50% of the billionaires parasite issue with those 5, the remaining few will suddenly decide that social welfare programs are a good idea and donate so much that they are no longer billionaires.