Of course he doesn't need the salary. This President scam thing he's running has at least quadrupled his brand recognition and asking price. Not to mention how his New York tower and golf resorts are raking in taxpayer bucks paying for rooms and golf cart rentals for Secret Service members.
Then there's the fact his supporters are footing all his legal bills.
This scam is way more profitable than steaks, vodka, building signs, and universities,  combined.
And if he pushs through his tax reform, he'll save hundreds of millions of dollars in taxes over the next few years.
What does he the pittance of a president's salary for? 
And the best part? His supporters refuse to open their eyes.