Obviously Hilton are worried that people might not want to pay the rather extortionate $25 per day (or whatever it is now) for t'interweb access.
I was in Vegas a few months ago and there you automatically get charged for the ~$28 per day resort fee, of which the only useful thing is the WiFi. Though I believe it is possible to ask/argue to have it removed or to try it on and get it comp'd. YMMV.
Like another commenter above said, the more you pay for a hotel room, the less you get thrown in.