Because you didn't know what kind of strings may have been attached to this act of kindness. It was a nice gesture, but he'll be fine.
He was pimping Starbucks, nothing more. When I was working at Borders, I had coupons to give out that the company gave us managers for a free drink. It was to promote drinks in the cafe and as an apology if something didn't work out for the customer.
It's free, but it's also a plea to be a devote customer.
