The whole of carpet sounds weird - typically what I've seen is carpet in the walkways.. if you want it in the booth, you pay for that.
Unions are one of the things killing pricing. Of course you can't blame them for the internet fees - that's just them holding you hostage because they can.
While the convention center at Denver Comic Con does provide WiFi, it's so saturated that it's useless. Hell, during Dragon Con, even outside on the street it's nearly impossible to make a phone call or a SMS message with the 90K people in a 4 block area. I'm guessing the phone companies could fix this (how else do you service football stadiums with 140K people?)