+1 I ride because I like it. It started to save money, but I kept doing it because I enjoy it.

I sold my truck, so we only have one vehicle. My wife doesn't like being without a motorized vehicle during the day, and that's enough of a motivation for me not to take her van

You could always keep your keys in a bucket of water outside. If it's cold enough to freeze the water, then you have to ride. If it's warm enough that you can get to the keys, you'll want to ride