It's because Greene actually drank the kool-aid, and has now found out what's in it, whereas most of the others only pretend to like it.

A big part of why the republican party has been so successful politically is their unwavering unconditional loyalty to the party. They can make waves politically with a smaller amount of people as long as they stay united. It's basically mostly just political strategy. It's also why this is a huge fucking deal. We can use this to start putting more pressure on the republican party and making that strategy less viable.

Some people think jumping ship in frigid waters will save them somehow, when there's no search and rescue looking for them... while other's are wise to just go down with the ship anyway... at least they feel like they're not alone.

they think they can still make money and gain power through their connection to him, maybe?

You run to the right to wing the primary and waddle back to the center when you've got control. Because the center is where all the money's at. The fringe is just people spun up hard enough to show up at convensions, scream at people during board meetings, and then stomp through oppressive heat and knock doors until nightfall for weeks at a time to scream "They're destroying America!" at anyone who answers the door.