Take Me Out to the Ball

Went to a Giants games yesterday. (Thanks Sis) Baseball, that most all American of Father-Son bonding activities. Lots of fun. A question. How in the hell do ticket scalpers make any money? We are walking into the Stadium as the National Anthem is being played. In the two blocks before the Stadium, we pass half a dozen guys selling tickets. They each had their tickets fanned out in their hands. The game was about to start, and it seemed pretty clear that the scalpers were going to be left with tickets. So even if they has sold some tickets above sticker price, they were going to eat the cost of lots of tickets. So how does this work out?