Wilson (as Ambassador to Gabon) had/has connections to the Gabon Chief of State, Omar Bongo, who was the chief African ally of the French oil company TotalFinaElf, a major beneficiary of the Oil-for-Food bribes. Prior to the Iraq War, they had a contract with Saddam's regime worth an estimated 12.5 to 27.0 billion barrels of oil reserves. Also he had connections via the Middle East Institute and Rock Creek, both of which are Saudi controlled.
Wilson's wife Jacqueline was also apparently a lobbyist for Bongo and it seems Wilson was pretty chummy with Saddam's weapons buyer, having dinner with him on the eve that Kuwait was invaded in 1990. She is now an advisor to Bongo, her picture from a 2005 conference can be found here That makes it very clear that there are connections to oil-for-food. No wonder Wilson can afford his lifestyle.
No Hint Seen in Memo that Plame's Role Was Secret (Valerie Wilson, a CIA WMD managerial type)