Not enough money flows to places like Flint. Michigan just barely ekes out a return on dollars remitted to the IRS; they're in the bottom quartile of benecifiaries. Meanwhile, for every $1 a Floridian pays in taxes, they receive $4.50.
The historical reason Michigan is such a low drag on the USG has a lot to do with the businesses Flint enabled.
This is such a straightforward point to make, and so easily Googlable, that I feel like you have to have known it already. Some of your acerbic comments are interesting because they bring a perspective to these discussions that I (for one) wouldn't think to consider. This was not one of those comments.