When travelling on corporate terms I have to check the "room price" as selection criteria. Extra wifi is a different cost, which is expensed differently. Thus by charging it independently they can make more money (as long as people book WiFi, on domestic (EU) travel I simply use my mobile data, less hassle to setup, all ports open, already paid)

An observation on the side: My travel policy covers a number of "paid movies" depending on the nights travelling. With proper internet that business of hotels finishes and travellers get their pr0n — oh I mean action movies — for free without it appearing on the hotel bill.