You Can Buy Tickets Just For One Match?

So, I get a text from a friend, saying that she watched UFC 141 in Vegas. (Jealous as a fucking heroine addict.) She says that people were selling tickets just for the Brock Lesnar fight. Is that even possible? I always thought that you bought the ticket and you get to see the whole event. My friends not the biggest fan, so I think maybe she got it from a Sculper type person. 400 bucks just for 3 minutes of action. Oh my. 400 big ones for pretty nice seats apparently.

Anyone know though?