Why Didn't Somebody Tell Me

So, in one week from now, I will have worked at Staples for 7 months. Most full-time employees participate in a Tim's run, taking orders for people and bringing coffee at some point in the day, two or three times a week. I have thus far declined, for although I would absolutely love to have a coffee or a hot chocolate or a cafe mocha or some other such caffeinated delight, or even a chocolate glazed donut, I haven't really felt I can afford to take my turn treating 10 or 15 other people to whatever they happen to want from Tim's that day.
My somewhat frustrated question of the day is, why is it that I didn't learn until TODAY that these weekly Tim's runs are almost always paid for by the company?