I took the trouble to go and meet 'scalpers' during the Olympic games here in Sydney. I was curious how much money they made from the tickets and I learned it was a LOT. I met the boss of one outfit of ENGLISH (obnoxious types at times) who, though routinely offensive did answer my questions and introduced me to some of his 'employees'. He was making a lot of money by placing his people in queues, buying tickets and organising his other people to sell them. He was making $1000 daily, his employees about $400 each. They travel all over Europe and the UK doing this. They are professionals at it.

It's not illegal but it is somewhat unethical.

Most of the ticket sellers sell on eBay or elsewhere. But there is a better way to get money out of the secondary market.