Well, getting the bike and accessories is an initial cost, which is no different than drive-commute, where you need to pay for a car to start.

I suspect that your point of view came from the fact that you already own a car.

I don't - I couldn't really afford to buy a car, maintain it, fuel it, and the deal I made to myself was this:
A bus pass is just shy of $100CDN. I use it to commute to work, and to pick up the car share to go to odd places (e.g. grocery runs). I didn't buy a pass this month, but loaded up with bus tickets for the same amount. If I blow through the $100, that's a sign that it's not worth it.

I have around $40 CDN left, that's with me cheating quite a bit on the weekdays, and there's a week left to go.

Seems like it's worth it - it would be more if I get my rain gear from Vancouver here, then I have even less excuse not to ride into work.