rtalk25... I don't recall seeing or hearing about any subsidies on that DTW-ACY route, but I would think Michiganers would be as apt to go to AC as Illinoisans, since the Chicagoland area actually has more casinos than metro Detroit does.
I agree with aubreyfromwheaton that connecting on Spirit is a bit risky, since there is little margin for error in their schedules. Of course, if you are going to the Caribbean on Spirit, you have no choice but to connect in FLL most of the time.
Let's just see what happens around the first part of July; I am very interested and cautiously optimistic!