A general rule of business is to not invest your own money. So if you can get others to spend a few billion, that you’re directing, then at the minimum you might get a paycheck for the duration of the enterprise while otherwise throwing away other people’s money and you, yourself, are unaffected.
But, so far as I understand it, I haven’t seen anything about Trump profiting from his big failures (the casino in NJ, the airline, etc.). I understand his primary successes to be:
- Inheriting great wealth and then selling portions of that off for smaller locations in more urban areas (e.g. selling an apartment building in Manhattan @ $1000 sqft in return for a golf course in the countryside @ $100 sqft).
- Running a successful reality TV show and, actually, being naturally qualified in that space.
- Renting out the name and managing buildings (e.g. property management) for a fee.
- Renting out the name to various products and services (water bottles, real estate schools, etc.)
My personal sense is that he genuinely is quite talented at self-promotion and knowing how to entertain the average person.
Having read through some of his depositions - so, taking his own description of his own daily life - he seems to run his businesses by simply trusting anyone who walks in his door. If they (a son, a daughter, a security guard, a janitor, etc.) come through his door and say that they have a great idea for how to do X, then he’ll tell them to go for it, he authorizes it. And then when another person comes through and says that the other person is totally screwing up X and that it’s a disaster, then he’ll authorize the new person to take over and get it fixed.
These are all more recent documents, so I’d theorize that he used to run things himself and over time has learned to leave most of everything to others in the land of real estate and property management. It’s still not - by my read - a particularly effective way to run a business but his existing operations do seem to have stayed in business for decades. I’ve seen his building in Vegas and, while it’s tiny and looks like something made in the 70s, it is still there and operating so I think we might assume that the family has figured out, by this point, who’s good at what and to stop getting in each others way so that things keep running.
Reports from his TV show indicated that he was very involved in the production, and took lead there. It was never #1, but it did do well.
In terms of his private businesses, he’s taken cues from others in Hollywood and simply cashed in on his name. Prior to the Presidency, that appears to have been his main success. But, he does seem to have been quite good at reality TV and, thereby, politics.
Aside: I recommend the TV show, Unreal.