Let’s say you’re a mega wealthy billionaire who has suddenly realized that if he cozies up close to a presidential candidate, he could have more power and wealth than ever before. What’s stopping you from figuring out who the electorates are and offering them whatever they want if they vote for your guy? What’s stopping them from taking the deal?
That packing the court bit is a great idea so long as you can make sure your guy wins forever and nobody bad will ever get in and pack the court again in their favor. It’s basically MAD, nobody wants to be the person to open that Pandora’s Box.