Proof of Stupidity (PoS) is a more appropriate name for this movement. They are trying to prove something while paying high fees to exchanges to withdraw "their" coins. And then, they prove they can't control the keys for long and deposit bitcoins back. I wonder why rational bitcoiners ignore that movement.
I hadn't considered the fees aspect of it, so i can understand why something like this would not really be viable if transaction fees are running high or in the case of people who have smaller balances. Also given that exchanges often charge higher then the actual network fees i can see why a lot of people would be put off participating in this.