The whole point of being a lifetime appointment is so that external parties cannot exert pressure on the justices. The system sacrifices a lot of other checks and balances because it puts "lack of external pressure" on a pedestal far far above most other things. When the justices put themselves in positions where ruling one way or another could make the difference between earning $3M to $100M or $0, its a complete travesty for the court and the nation. It means we get all the worst parts of lifetime appointments and we still don't even get the primary benefit of it.