A crucial point, perhaps ill explored, is whether he can see past his own pecuniary fortune. That is a point on which a number of gospel illustrations turn.
There seem to be hints that the answer is yes.
Just for starters, becoming president would mean he would have to hand over all control of the Trump empire to a trust. That does not sound like a prospect that someone married to his money would cheer.
What's the source of that requirement? And so what if his assets are managed by "a trust" (or somebody other than himself), as long as he knows he's the ultimate beneficiary, he can steer favors to "the trust," just as easily as he could if control wasn't under his direct hand.
The mechanism used to isolate the official from gain is sale of the asset, as far as they know.
The trust is considered "blind" because eventually, through the sale of transferred assets and the purchase of new ones, the public officer will be shielded from knowledge of the identity of the specific assets in the trust. Without such knowledge, conflict of interest issues would be avoided because no particular asset in the trust could act as an influence upon the official duties that the officer performs for the Government. ...The Use of Blind Trusts by Federal Officials - CRS Report for Congress (RS21656)Blind trusts may be used by such Government officials even when the disqualification requirements of federal law do not apply to them, such as for Members of Congress, the President, and the Vice President. ... [of course they "may," no law against blind trust for anybody]
... federal officials in the executive branch of Government, other than the President or Vice President, must generally "recuse" or disqualify themselves from participating in any particular governmental matter in which they have a financial interest, or in which their spouse, dependant children, partner, or business with which they are associated, has a financial interest.
Trump is willing to risk it all AND his reputation for his country. If he crashes and burns with his presidential run, he may no longer be thought of so highly as a successful businessman. He is pretty much laying down all he owns on this bid for president—how much have the others laid down? They lose nothing, they go back to their political corners.