Because they are influenced by American Idol?
I definitely know that there is a markable difference in the sound of my voice in the periods when I take it seriously and practice every day, as opposed to the periods when I don't.
I've noticed a curious thing, which is probably a ''DUH'' kind of moment, but since I don't read about this stuff, I wouldn't know. Your vocal cords are controlled by muscles, right? And if you don't use them, they ...how do you call it..dwindle? Just as the other muscles in your body. But muscles that have been trained before reach the same top ''strength'' quicker when you start training again then the first time around. Like muscle memory. Does that sound right? Or is that just me?