I think what he's really saying is "I don't understand the math, so I'm going to do it a different way". I'm honestly not trying to knock Scotty because the vast majority of bettors don't "make numbers" for the games they handicap.
This is a big reason why you so rarely see the average bettor betting dogs in MLB. They have no idea how to quantify if that dog is undervalued. On the contrary, it's easy to look at favorites and convince yourself they're the right side.
Not surprisingly, blindly betting MLB favs throughout the years would have you much further in the red than blindly betting dogs.