Right now Trump is tickling people's ears by telling them what they want to hear, especially with regards to immigration issues. Meanwhile, the establishment candidates are trying to assure the donor class that their landscaping bills won't go up.
With Trump, it's kinda like joining a cult. At first you hear about all of the nice things that they believe that aren't all that different from what you believe. But eventually they pull back the curtain and show you what else they're into, and by then you're in deep. I think eventually he will say or do something that will turn off a lot of people who are currently following him, but by that point he will have funneled a lot of money that would have gone to other candidates. Hillary will owe him big time. Maybe that was his plan all along!