An “06880” reader with waaaay too much time on his hands asks:
“How come we pronounce one year ‘two-thousand-and-nine,’ and the next one ‘twenty-ten’? Wouldn’t ‘twenty-oh-nine’ and ‘two-thousand-ten’ make as much sense?”
Um, sure.
All I can think of is, we want the next decade to be as different from this one as possible.