I like TicketHippo. It isn't the coolest name and it's not what you'd call a punk rock band...but I think it does the best job of conveying the message. "Seats" just doesn't do it like "Tickets" does. And TicketHippo has a certain charm in itself. I think it's easiest to associate with a ticket-selling site and easiest to remember.
Sports sites can try to have the cool or edgey look to them; for a ticket site, simple and cutesy is fine. Whatever makes the job easiest for the purchaser, and something straightforward probably has an advantage in these situations.
Perhaps if it was a site trying to pioneer a new idea, or a new method of doing things, one of the other brandings would make more sense. Just my two cents!