I chose it's good for my health, which is kind of a marginal reason, and I like my ride.

There was no choice for "It's cheaper and faster than the subway," which along with "I like my ride (better than riding the subway)" are the primary reasons.

I didn't choose "I can't afford a car," though it's in some sense true, since as a New Yorker, the calculus for car ownership is different, and the cost is quite different. Here, a car is an extravagance that most live quite happily without, rather than a necessity one is deprived of.