The entirety of gifts received by the justices over the past 2 decades is about $3 million. About $2.4 million of that went to Clarence Thomas.
Thomas was bought for $120,000/year.
Even if that’s just the tip of the iceberg, and the total monetary equivalent compensation were say, $1,000,000/yr… Over 20 years, that’s still only 2% of a billion dollars.