Is Donald Trump a Democratic secret agent?

It's the same kind of phenomena, I think, as being lord or lady in the UK and people would actually buy titles there.  Here in the US, we don't have that but to be a former president does have its perks as it is one of the few titles that we do have (and our most important one) in the US.  Titles open doors.   Active presidents have not; however, former presidents are actually able to do much more post-presidency than during presidency.  Look at former President Jimmy Carter as probably the most extreme example as he was largely viewed as a very poor president; yet, he has a tremendous following today, has established or supported certain charities/non-profits (ie. Habitat for Humanity) and more to great effect.  Bill Clinton actually once discussed this relationship post-presidency openly in an interview.   He gets paid up to $300k a speech and they've made over $160 million in just the last decade between books and speeches post-presidency so there is a lot of money that follows afterwards and that will be income that he can garner every year until the day he dies.  He'll always be a former president.  He also established a number of charitable foundations (one with Bush Sr. even) like Carter.  There's less information about Bush, Sr's post-presidency wealth change. 

For someone like Trump, he'd likely blend the two and use the title to open business doors as being one of those names of names (after all there's only been 42 presidents and only so many living, right?).  Given that Trump also has a penchant for writing books, it'd add clout to that as well.