Can anyone explain the theory behind the superwide stance?

[HawkeyeCubP]

The stance, itself, is slightly noticeable, but I think the way they get back to a normal standing position after each pitch (not batted or wild/passed) is what looks ridiculous and sticks out poorly - move each foot six-ten inches in, back and forth, until feet are normal width apart again = very jerky.

But not much sillier-looking by comparison, in my opinion, than navy, flat-front pants.