If you've ever used a ticket service like Stubhub or bought tickets from someone on eBay or even from a friend, you've bought them from a scalper. You're still buying tickets second hand, it's just that they don't have the usual connotation of scalper because they're not some guy at the venue buying and selling. Still the same thing.

This is an area where the modern world is backwards and facilitates a legitimate scam- say you live in Hawaii, tickets go on sale for your anticipated event at 8:00 am local time, you wake up, go to buy the tickets to find out the event is sold out, but you go on eBay and suddenly find tons of tickets available from sellers in New York who had a several hour jump on you, and bought out the event. They have no intention of going to the event of course, but just to take advantage of people who are desperate to buy because the sellers on eBay have created an artificial shortage.