@OmSigDAVID,
In fact, it's stranger than that.
http://www.youtube.com/watch?v=xsTIhT9KVPg
You'll notice that, suddenly, his voice isn't particularly low. Lisa Marie Presley confirmed that he had a much deeper voice behind closed doors than the one he employed in public. She also reported that he drank alcohol (socially), cursed and cracked funny jokes.
So what gives?
Like almost all of the greats... Michael had his game, and he played it well. All icons have flair. Think about it: Marilyn Monroe, Jack Kennedy, Ali, Lou Reed, Elvis, Hitler. (Don't laugh about that last name; he's a major icon of the 20th century.) Each of them worked his own pretty good schwerve. They projected "image."
Michael was once featured in The National Enquirer in a photo of him lying inside a hyperbaric chamber. Various sources say that HE HIMSELF gave them that picture. He was shy in his personal life. Publicly, he knew how to work his audience.
I'll miss him. It's not my place to judge him personally; I'm amazed by people who do. Was I ever in his bedroom? A court of law acquitted him; the court of public opinion tried to execute him. I won't judge him on what I never saw. I'll judge him on what I saw. He was the greatest performer in the history of pop music. He had the greatest voice, he created the performance playbook of dance moves, he had thirteen #1 hits... twenty eight top 10 hits... out of only 59 singles! His first #1 was at the age of 13. His face is the second most recognized of the 20th century... behind Elvis'. (Most polls have him roughly tied with Muhammad Ali and Kennedy for second place. Hitler, Stalin, etc. are lower on the list!)
And here's my point: Which of Michael's faces do you figure was most recognizable? I think it's clear that the face of his later years is, by far, the most distinctive. Many people found it bizarre, but it was all Michael's own creation. He sculpted it. He sculpted his image. His voice. Neverland. It was his world... alien and lonely as it might've been.
His legend will only grow. The CD/DVD that will soon be put out to show us what his tour would've been like will doubtlessly be the biggest selling album ever... blowing the doors off of "Thriller." I just sense that. Legends only grow around icons and icons... idols... are IMAGES.
Whether or not the voice was a put-on... it was memorable and, thus, very effective.