I disagree, the rich appointees to the U.S. government in most cases (e.g. Treasury Secretary) need to sell all or most of their potential conflicted assets (tax deferred) with the proceeds going into a blind trust.  For example, Hank Paulson sold $500M of Goldman Sachs shares.  Other Treasury Secretary include Steven Munchin worth ~$300M, John Snow ~$100M, Paul O'Neill ~100M, and so on.

I agree with your statement on less likely to be bribed, but he is more likely to favor policies that affects his and his family's net worth.