Your assumption is that if this is based on capitalism, there must be nothing wrong with it. I'm not exactly sure that's a good assumption. Take the recent credit derivatives debacle that threw our economy into a tailspin. Hey, Goldman Sachs and others created a product, people were willing to buy a product at a certain price. There's a risk element just like there is with any other security. That's capitalism, what's wrong with that? i think history demonstrates that, while based on capitalism, how unhealthy this activity was to our economy.
As far as tickets go, let's say these tickets were priced at value that both the promoter and the artist agreed would be fair compensation. Their goal being to make some money for the work they produce while at the same time, setting the price in a range that allows a broad base of fans to enjoy. Scalpers come in, buy up the majority of the tickets and resell them at double the value. Sure, that's capitalism. But that act may have effectively shut out a large fan base that can't afford that new price. What's wrong with that? Well, from a market perspective, nothing (perhaps). It's supply and demand. But from a societal perspective, it starts to put a bigger wedge between the haves and have-nots. Entertainment/Sports/etc. becomes a industry that can be enjoyed only if you have a certain amount of wealth. In the long run, that may not be beneficial to that industry as the fan base drops. Keep in mind that the industry itself had set a price in order to maintain/increase fan base. It was the act of a third party that may have priced out a potential consumers.