The only way that scalpers can create artificial demand is if there are no attendees willing to pay the price scalpers want to charge. In that scenario, scalpers sell to other scalpers at higher and higher prices, and the last person (scalper) to buy loses. If the last scalper buys the ticket for $4,000 and there is no party willing to buy the ticket for at least that AND see the show, the scalper is left with two options - go to the show (which by definition for the scalper provides less utility than the ticket price warrants), or sell the ticket at a loss (or possibly for $0, if there are no buyers).
I think there is a good analogy to other forms of speculation, particularly in commodities. Speculators "drive up" the price of oil by buying and selling it for more and more, but as long as consumers are willing to pay for that oil, the price is justified, and the original sellers forfeited their potential profit.
Granted, oil and housing speculation can lead to bad things for the economy as a whole. Here I think the analogy fails, since tickets are inherently a temporary market with an expiration date. Without an expiration date you can have bubbles, and bubbles can burst.