I've read that Trump doesn't have a real $Billion dollars of liquid capital to expend on his presidential campaign. He'd have to start selling off assets to produce the hard dollars to compete with the Democrats.
Because of that, he does have a 'donate' button on his campaign page. I'm good on that, and will throw a few bucks to his campaign, as I can spare them.
I think it was in his speech in NH yesterday that he said he won’t take money from lobbyists, but if regular folks wanted to donate he’d be honored to accept their donations (paraphrasing). And, something to the effect of it shows everyday people support him and that’s great.