Any objective analysis of Mr. Trump's so-called business "success" shows that he's a failure, even for his own bank account.
As many others have noted, if he had invested his inheritance in mutual funds that tracked the Fortune 500, the Dow or any other reputable index, he would have made more money sitting on a beach or golfing than with all of his "entrepreneurial" projects. Almost all of his businesses leave a trail of detritus and far too frequently he is the only one who profits.
While it's true that in any business there will be disgruntled employees and vendors, in Mr. Trump's history there are legions of people that he has left unpaid or damaged in their businesses. His lack of ethics and morals are out in the open for all to see.
All businesses require serious banking in order to operate. Because of Mr. Trump's business history, almost all banks will not work with him; this is the most telling fact about him. If the bankers- who will go to almost any lengths for a profit- don't like your business, then you really suck.