Having public transit doesn't make the public transit useful. I could bike to the airport (which is 30 miles away) faster than I could get there by bus. And I'm not a fast cyclist. Plus to get to a bus stop that would make the transport to the airport take less than 3 hours and 3 transfers (more than 2 increases the bus fare), I would have to drive to a park'n'ride. Or bike to a park-n-ride but take no luggage.

Most cities in North America just aren't designed to be as accessible as those in, say, Europe, without a vehicle. Since I have to drive to and from the airport 1-3 times a week for work, not having a car would make my life hell.

(And yes, I suppose I could move closer to the airport, but my office is also 30+ miles from the airport so I'd be spending 6-7 hours a day on a bicycle or be forced to commute to work by car.)