I have no issue with scalpers, it is my belief that they reflect market forces. A scalper isn't likely to mark up a $100 ticket to $1000, unless he/she knows that it will sell for that much. What's amazing is that with sites such as StubHub, it has become a way for observers to gauge the interest in sporting event or concert. For instance the past few years, Michigan football attendance has been down, and so many people were following the StubHub price listings as a way to gauge fan interest in any particular match, obviously games against Michigan State and Notre Dame were going to yield much higher prices than against Minnesota or other non-marquee matchups (nothing against the Gophers).
I scalped a little when I was in college, but as a student we were able to tickets at the students rates and there was always a student or two in one of my classes that wasn't going to be able to make the game and would give me their ticket. They had already paid for it, and so just asked to split any profit, so on my way to the Big House I would listen for anyone wanting a ticket and could easily sell it, not a ton of money but when you're in college an easy $15 means quite a few pizza dinners. Another time was for the MN Renaissance Festival. My friend bought 4 tickets at the State Fair for $15 each (normal price is $25), but when I went with him and another friend he still had a spare ticket. So when we walked to the gate I quickly sold that extra ticket for $15, so my friend wasn't out any money. The person that bought the ticket was happy as he saved $10.