After a very successful season of Hyouka, an additional fan-service episode wouldn't hurt as it gives some hint about Chitanda and Oreki relationship. Honestly I don't understand why people don't like it, it is a fan service, but a very good one and add some slice of life with the characters and also very enjoyable. It's a bonus, not something you have to pay for, so don't yell at it. It is for us to enjoy the universe, and those who hate it probably the one who doesn't have a mind of a businessman as well as a normal person, mostly must be the NEETone on the internet.