True, but most expats plan on returning to the USA someday. If one goes down the path that you suggest one would have to divest themselves of all property and bank accounts in the USA. It's not for the faint of heart.
My personal opinion is why bother. The first 5 years I was in the ME I paid a grand total of 0 to the federal government. Now I pay around 10% tax on my gross wages. I can live with that. It's a heck of a lot better than when I was in the USA.
Typhoonpilot