Scalping DOES NOT contribute with the society
How is that important? It's a business, not a public service.
If the price a scalper (or anyone for that matter) sets is unfair, the market will reject it. Simple.
Maybe that $50 ticket really is worth $125 to someone else, and there's nothing inherently wrong or unethical in pocketing this price difference, or with having a 200-300% markup. It'd be foolish not to.
What is a fair markup to you anyway? 1%, 10%, 20%, 50%, 500%? Where do you draw the line?