Cab fare out of DTW is highway robbery. There is only one company assigned to the airport, and they definitely take advantage of their monopoly.
A ride to Dearborn, only 10-15 minutes away, is over $30. Thanks, but no thanks.
Sometimes I get to the airport by booking cheap one-way car rental reservations (TO DTW from the suburbs, not the other way around).
Not only do I save money and earn miles, I also feel good knowing I am not supporting the cab company at DTW.