My Glock 22 is O.D.
I bought it because the price was right (used, less than a year old at the time).
I'd rather have a black one, but the O.D. works for me for now.
I have no idea if they're gonna continue to make 'em in that color. I thought they'd be popular because of R. Lee Ermey's "This is my Glock. There are many like it, but this one is mine" ad campaign.
I don't plan to sell mine anytime soon.