You really don't think that if Obama does some personal friends a favor that nets them a pile of cash they won't return the favor? Obama's mansion before he was elected President--well before--was such an arrangement. Quid pro quo is equally bad to self-enrichment.
Quit it. You are making that up. I will not accept your made-up premise as debatable. Your imagination is not relevant. Obama got rich with him and his wife writing very successful books and giving speaking engagements. There is no quid pro quo except in your imagination.