I mean, the guy’s made billions of dollars in the private sector, so he must know what he’s doing – yes? But try telling that to anyone who invested their hard-earned dough in his great business venture, Trump Hotels & Casino Resorts Inc. It was 20 years ago this summer that “The Donald,” for the first and only time, let ordinary schmucks on Main Street become his business partners and put their money where his mouth was. The property mogul and best-selling author of “The Art of the Deal” raised $140 million from the public in the IPO of Trump Hotels & Casino Resorts, which owned his business interests in Atlantic City and elsewhere.