Trump didn't get elected because he was for 'average Americans' and he didn't get elected because he 'had all the money and didn't want to appease anyone financially'. Neither of those are the real reasons Trump got elected. Sure, his popularity as a television personality appealed to many that only knew him from The Apprentice.
We have to look a little deeper for the reasons people voted for Trump. He spoke to them in their language, not the language of a professional politician - all polished and proper. They liked that to begin with. More importantly, he spoke their language. "You've been forgotten, you've been left behind. The rich 'deep state' has kept you oppressed. The immigrants are taking your jobs" etc.
Many republicans felt that things were going to be really different that this time they would matter, that they would count, that he would 'drain the swamp' and that by electing him they had done what matters and what would make the difference. They felt left behind and that the 'elites' up in New York looked down on them and belittled them. They wanted someone to fight for them and to make them important too, and he spoke to that inferiority complex in them and it registered with them. Of course they should have known, he's a wealthy, entitled New Yorker to the bone
But he didn't. He hasn't done anything he promised although despite that, his most vocal supporters cheered him on during the 'phony witch hunt' by Mueller. The 'fake news and lies' about his bribing the government of Ukraine to do his bidding. And just about every other egregious and un-presidential thing he's done over the past 3 years.
But there's a lot of republicans that have been in denial for years now because they're realizing that that Trump is not their champion, that things haven't gotten better for them. They're seeing that republicans in Congress don't have any interest in them at all, not in the least. They don't want to accept that they were wrong only because it harms their allegiance and it injures their pride. But there are 'real' republicans that can look at this without the rose-colored glasses on anymore and see that Trump isn't turning out to be the man they thought he would be.