The Gates' may not be motivated by money, but Clark made the absolute and naive statement that rich people cannot be motivated by money... sure, not all are, but I don't need to prove that all rich people are motivated by money to disprove Clark's claim that Trump cannot be. 

Trump could easily get himself into trouble if he is careless here. Think of the distress and anger over people giving donations to a charity in the hopes of getting access to Clinton. If there is a more direct lining of Trump's pockets in exchange for influence, I would hope the response would be proportionate.