This is pretty sweet deal. I wonder if anyone will MR for this. I can see people living in Atlanta doing it, MR or not. But, even for people who do not live in Atlanta, this can work. I did a sample on March 12th. All of them are nonstop. I tried Charleston, SC as it is the nearest one. But, I could not come up with a good example with it for non-stop and low cost. But, if someone is serious about it, they can play with dates and minimize travel time by using Charleston.
ATL - MDW 8:15 - 9:10 AM $80
MDW - ATL 10:15 - 1:00 PM $80
ATL - MDW 1:40 - 2:40 PM $80
MDW - ATL 3:25 - 6:15 PM $124
ATL - MDW 6:40 - 7:35 PM $124
MDW - ATL 9:30 - 12:15 AM $80
Total cost ~$600 with a couple of close connections & one day Worth it? That depends on how often someone travels on WN without the CP.