Most cynically? I sincerely believe there's more value he can extract from American workers if he can keep the ride going on just a bit longer. For example: it's better to keep the stock market a float a volatile so he can transfer a bit more wealth from the American people before it does eventually break down.

Yes, they'll all be on yachts when the shit hits the fan, but they're still fighting to figure out who get the biggest yacht, and right now it seems like Trump has more to milk from us before he entirely lets this thing fall apart.

He also has dementia so he probably can't plan that far ahead. He's operating on a very short term feedback cycle: this reporter asked me a question that makes me look bad, so I call her piggy. That's the timescale we're operating on. Not even quarterly profits but moment-to-moment.