The biggest reason why I don't ride into work some days is due to the weather. Here in Az it has been really Wet this jan, the next 5 days are supposed to rain. So I take my motorcycle on those days since I have the rain gear. If I had rain gear for the bicycle I would be taking that. However, I buy myself new gear when I can afford it but try and be reasonable as well.
Keep us posted on your first ride in!