I once worked for a contractor that did the temporary for an exibition hall in Dallas. On top of paying $1500 to the promoter for an 8 X 6 stall, the exibitors paid $40 to the electrical contractor for 2 days use of a 15 amp duplex receptacle. If 240 or 3 phase or a panel for multiple receptacles was needed, the price was a good bit higher. The contractor did all the shows there, so he was able to reuse the equipment and was set up for storing and maintaining it. The guy that did the telephone temporary just abandoned his stuff after it was over. We were forbidden to take any of the phone cables home. It was thrown in dumpsters.