Michigan seems to be a major destination for filmmakers these days as well.
Low Winter Sun is a new cop drama set and filmed in Detroit.
http://www.michiganfilmoffice.org/Made-in-Michigan/Film/Default.aspx
Never got a call for Transformer 4.
Well, the filmmakers probably have very few hurdles to clear with Detroit. And instead of paying union-scale stuntmen as bad-guys, they can use real thugs.
If they freak out, the good guys can just shoot em...on camera. Who would care?