For many people, money is a great motivator.
Trump was also a businessman, so he would not know what kind of swampy rinos or greedy power hungry ambitious politician some of these people are. He likely got told that he should endorse or appoint some, because they were the best choice to beat the democrat, and that any republican was better than any democrat.
Now, where has that been said?
Also, desantis owed his original election as governor against the crack head gillum, to the last minute endorsements and rallies that Trump did for him.