RE: The suggestion that Trump has "lost money" as a result of becoming president (because his very shady numbers are reportedly less in 2017 than in 2016, says Forbes)...
That is one way of looking at it. Another - I think more accurate - way of looking at it is that ALL other presidents divested themselves from their businesses. Thus, all other presidents made $0 from their businesses while in office.
Trump, on the other hand, refused to divest from his businesses. As a result, he continues to make tens of millions of dollars - maybe more - from his businesses.
He does so largely in secret and with unnamed, offshore accounts so we don't even know who he is doing business with. He is the least transparent of presidents. And so we do not really know the state of his financial affairs... who is making money with him from him and who he's making money with and from.
Regardless, making FEWER tens of millions of dollars is not a sign that one has not profited from the presidency. His money is complex. It involves his income, but also his outgo (in settling lawsuits and paying off bribes and mistresses and other more shady dealings... also, how much of his supposed loss is due to his own damned incompetency, cheating, lying and payoffs? Becoming president may have nothing to do with any losses, other than the light was shining on his shady dealings more and people were maybe more likely to not cave to his bullying).
PROFITING LESS - even if it turned out to be true, and frankly, I'm dubious - is still profiting.
All other presidents' profit from their businesses? $0, because they divested.
Trump's profit? Tens(?) of millions of dollars.
"No one can serve two masters. Either you will hate the one and love the other, or you will be devoted to the one and despise the other. You cannot serve both God and money."