My own theory about Clarence Thomas is that, obviously, he initially got the money because of ideological compatibility. He wasn't bribed to hold those views; he was induced to *keep* those views. The function of the money and luxury vacations is to prevent evolution of his judging; we do have many historical examples of Justices who've evolved as they've seen different things. But that won't happen if the money and luxury spigot is flowing this way.
@rtushnet Your take makes sense to me. When Thomas was appointed to the Court, he was already an ultra-conservative. Lavish gifts and membership in the club has ensured he stayed that way. It's like omerta at this point.