I think the appeal is simply that these people are losers, and I don't mean that because they can't win at golf or any other type of competition athletic or otherwise. They are losers because they can't accept responsibility for their own actions or decisions that have put them in a cycle of misery. This is a consistent theme for not just MAGA people but Republicans in general; there is always someone else to blame, it's never their fault. These are people without the ability of self reflection or introspection.
If they have a car accident, suddenly, it's the Federal Government's fault, never mind the fact that you ran a stop sign an hit a truck. This is the kind of thinking we are dealing with. These are people that blame everyone but themselves for their lot in life, as if they aren't active participants in their own lives. Which by the way, lets face it, most American's live a pretty decent existence, the fact of the matter as many of us are ingrates.
At the end of the day, this doofus appeals to these people because he, like them, thumb's his nose at reality, blames everyone and everything for any of his problems, and never takes any accountability for his actions whatsoever. In a sense, he's the doofus loser super "hero" that they all aspire to be. Winning isn't really done on a field, course, or any other venue, it's done thru learning and improving yourself.