@Scrbblchick -- Everything is cheaper about exterior latex paint! You can use any kind of roller and usually, water will take it off hair and clothes. Oil based paint gets on everything and will not come out. I've seen people use everything from gasoline to turpentine to get oil paint out of clothing, or from a floor surface. It's pretty bad.
Plus, oil-based paints *stink*! Latex doesn't smell nearly as much, and as the article said, it dries a lot quicker. Even exterior oil paint takes forever to dry, even if it's 90 degrees outside! And six weeks later, you'll still find paint spots where you thought you removed them. It's insidious.