I don't see a problem here. The general election will require upwards of 3 billion dollars between now and election day. It is unrealistic to expect any candidate, no matter how rich, to come up with that amount of cash. Even the richest of the rich don't have that much in liquid assets.
I can understand disagreeing with Trump's policies or distrusting his bona fides, but expecting him to come up with that kind of scratch is silly. He's not my first choice, but compared to Hillary Clinton, I won't even have to hold my nose at the ballot box.